diff --git a/Cargo.lock b/Cargo.lock
index 1734c68..d6d66a0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -116,6 +116,7 @@ dependencies = [
  "toml",
  "toml_edit",
  "wax",
+ "xxhash-rust",
 ]
 
 [[package]]
@@ -736,6 +737,12 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "xxhash-rust"
+version = "0.8.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "927da81e25be1e1a2901d59b81b37dd2efd1fc9c9345a55007f09bf5a2d3ee03"
+
 [[package]]
 name = "zerocopy"
 version = "0.7.32"
diff --git a/Cargo.toml b/Cargo.toml
index ad675ef..48c53b4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,6 +15,8 @@ toml = "0.8.12"
 toml_edit = "0.22.12"
 wax = "0.6.0"
 
+xxhash-rust = { version = "0.8.10", features = ["xxh3"] }
+
 [[bin]]
 name = "cimengine"
 path = "src/main.rs"
diff --git a/src/build.rs b/src/build.rs
new file mode 100644
index 0000000..04e2072
--- /dev/null
+++ b/src/build.rs
@@ -0,0 +1,60 @@
+use std::{fs, path::Path};
+
+use geojson::{Feature, FeatureCollection};
+use serde_json::json;
+use wax::Glob;
+
+use crate::{
+    types::CountryData,
+    utils::{get_country, read_config},
+};
+
+pub fn build() {
+    let config = read_config();
+
+    for processing_item in config.processing {
+        let mut features: Vec<Feature> = vec![];
+
+        let out_folder = Path::new(&processing_item.output_folder);
+
+        let mut countries: Vec<CountryData> = vec![];
+
+        for country_id in &config.main.layers {
+            let mut country = get_country(country_id.to_owned());
+
+            // TODO: Add tags support
+
+            features.append(&mut country.geo.features);
+            countries.push(country);
+        }
+
+        // TODO: Add country_rewrite support
+        // TODO: let countries = vec![rewrite_info];
+
+        // TODO: Add nature support
+
+        let feature_collection = FeatureCollection {
+            bbox: None,
+            features,
+            foreign_members: None,
+        }
+        .to_string();
+
+        let countries = serde_json::to_string(&serde_json::Map::from_iter(
+            countries
+                .iter()
+                .map(|country| (country.id.clone(), json!(country.config))),
+        ))
+        .unwrap();
+
+        fs::create_dir_all(out_folder).unwrap();
+
+        fs::write(out_folder.join("geo.geojson"), feature_collection).unwrap();
+        fs::write(out_folder.join("countries.json"), countries).unwrap();
+
+        if let Some(public) = processing_item.public {
+            let public = serde_json::to_string(&public).unwrap();
+            fs::write(out_folder.join("public.json"), public).unwrap();
+        }
+    }
+}
diff --git a/src/build/mod.rs b/src/build/mod.rs
deleted file mode 100644
index 353be42..0000000
--- a/src/build/mod.rs
+++ /dev/null
@@ -1 +0,0 @@
-pub fn build() {}
diff --git a/src/main.rs b/src/main.rs
index eecd53e..10b9283 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,6 +4,7 @@ mod build;
 mod init;
 mod new;
 mod types;
+mod utils;
 
 use types::Commands;
 
diff --git a/src/new.rs b/src/new.rs
index 6cef4f9..44dd799 100644
--- a/src/new.rs
+++ b/src/new.rs
@@ -1,7 +1,10 @@
 use std::{fs, path::Path};
 use toml_edit::{value, DocumentMut, Value};
 
-use crate::types::{Config, Country, NewCommands};
+use crate::{
+    types::{CountryConfig, NewCommands},
+    utils::{hash_hex_color, read_config},
+};
 
 pub fn new(cmd: NewCommands) {
     match cmd {
@@ -12,39 +15,37 @@ pub fn new(cmd: NewCommands) {
             foundation_date,
             flag,
             about,
+            fill,
+            stroke,
         } => {
             let name = name.unwrap_or_default();
             let description = description.unwrap_or_default();
             let foundation_date = foundation_date.unwrap_or_default();
             let flag = flag.unwrap_or_default();
-            let about = about;
+            let fill = fill.unwrap_or_else(|| hash_hex_color(id.clone() + "_fill"));
+            let stroke = stroke.unwrap_or_else(|| hash_hex_color(id.clone() + "_stroke"));
 
-            let country = Country {
+            let country = CountryConfig {
                 name: name.clone(),
                 description,
                 foundation_date,
                 flag,
                 about,
-                tags: Some(vec![]),
+                fill,
+                stroke,
+                tags: None,
             };
 
             let config = fs::read_to_string("config.toml").unwrap();
 
             // Validate config
-            let c = toml::from_str::<Config>(&config);
-
-            match c {
-                Ok(c) => c,
-                Err(err) => {
-                    panic!("Invalid config: {}", err);
-                }
-            };
+            read_config();
 
             // Get actual config
             let mut config = config.parse::<DocumentMut>().unwrap();
 
             // Add country to layers
-            let layers = config["country"]["layers"].clone().into_value().unwrap();
+            let layers = config["main"]["layers"].clone().into_value().unwrap();
 
             let layers = if let Value::Array(mut layers) = layers {
                 layers.push(&id);
@@ -53,7 +54,7 @@ pub fn new(cmd: NewCommands) {
                 panic!("layers is not an array");
             };
 
-            config["country"]["layers"] = value(layers);
+            config["main"]["layers"] = value(layers);
 
             fs::write("config.toml", config.to_string()).unwrap();
 
diff --git a/src/templates/config.toml b/src/templates/config.toml
index 76da029..a12faa3 100644
--- a/src/templates/config.toml
+++ b/src/templates/config.toml
@@ -1,18 +1,16 @@
-[country]
+[main]
 # Order matters when building countries. This affects the processing of area intersections
 layers = ["sample_country_id"]
 
 [[processing]]
-output_folder = "out"
-countries_file = "countries.json"
-geo_file = "geo.geojson"
+output_folder = "./out/map"
 
-# generate_colors = false
 # show_markers = false
 
 # Information for public repository in cimengine. See: https://github.com/CIMEngine/MapList
 # [processing.public]
 # name = "Sample Map"
+# description = "This is a sample map"
 # geo = "https://example.com/geo.geojson"
 # countries = "https://example.com/countries.json"
 
@@ -22,9 +20,14 @@ geo_file = "geo.geojson"
 # include = [] # [] = not filtered
 # exclude = ["test", "test2"]
 
+# Rewrite properties of all countries. All fields are optional.
 # [processing.countries_rewrite]
 # name = "name"
 # color = "#000000"
+# description = "description"
+# foundation_date = "2024-01-01"
+# flag = "https://example.com/flag.png"
+# about = "https://example.com/about.html"
 
 # Nature layers
 [[nature]]
diff --git a/src/templates/country.toml b/src/templates/country.toml
index d02190e..1beb7a9 100644
--- a/src/templates/country.toml
+++ b/src/templates/country.toml
@@ -2,4 +2,8 @@ name = "Sample Country"
 description = "This is a sample country"
 foundation_date = "2024-01-01"
 flag = "https://example.com/flag.png"
-about = "https://example.com/about.html"
+fill = "#000000"
+stroke = "#000000"
+
+# about = "https://example.com/about.html"
+# tags = ["test", "test2"]
diff --git a/src/types.rs b/src/types.rs
index 3f07025..a216775 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -1,5 +1,8 @@
 use clap::{Parser, Subcommand};
+use geo::{BoundingRect, Geometry, MultiPolygon, Point, Polygon};
+use geojson::{Feature, FeatureCollection, Value};
 use serde::{Deserialize, Serialize};
+use serde_json::json;
 
 #[derive(Debug, Parser)]
 #[command(name = "cimengine", bin_name = "cimengine")]
@@ -37,71 +40,156 @@ pub enum NewCommands {
     /// Create new country
     Country {
         id: String,
-        #[clap(short, long)]
+        #[clap(long)]
         name: Option<String>,
-        #[clap(short, long)]
+        #[clap(long)]
         description: Option<String>,
-        #[clap(short, long)]
+        #[clap(long)]
         foundation_date: Option<String>,
         #[clap(long)]
         flag: Option<String>,
-        #[clap(short, long)]
+        #[clap(long)]
         about: Option<String>,
+        #[clap(long)]
+        fill: Option<String>,
+        #[clap(long)]
+        stroke: Option<String>,
     },
 }
 
 #[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct Config {
-    country: CountryConfig,
-    processing: Vec<ProcessingConfig>,
+    pub main: MainConfig,
+    pub processing: Vec<ProcessingConfig>,
 }
 
 #[derive(Debug, Serialize, Deserialize, Clone)]
-pub struct CountryConfig {
-    layers: Vec<String>,
+pub struct MainConfig {
+    pub layers: Vec<String>,
 }
 
 #[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct ProcessingConfig {
-    generate_colors: Option<bool>,
-    show_markers: Option<bool>,
-    output_folder: String,
-    countries_file: String,
-    geo_file: String,
+    pub show_markers: Option<bool>,
+    pub output_folder: String,
 
-    tags: Option<ProcessingTagsConfig>,
-    countries_rewrite: Option<CountryRewriteConfig>,
-    public: Option<PublicConfig>,
+    pub tags: Option<ProcessingTagsConfig>,
+    pub countries_rewrite: Option<CountryRewriteConfig>,
+    pub public: Option<PublicConfig>,
 }
 
 #[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct ProcessingTagsConfig {
-    include: Option<Vec<String>>,
-    exclude: Option<Vec<String>>,
+    pub include: Option<Vec<String>>,
+    pub exclude: Option<Vec<String>>,
 }
 
 #[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct CountryRewriteConfig {
-    name: Option<String>,
-    description: Option<String>,
-    foundation_date: Option<String>,
-    flag: Option<String>,
-    about: Option<String>,
+    pub name: Option<String>,
+    pub description: Option<String>,
+    pub foundation_date: Option<String>,
+    pub flag: Option<String>,
+    pub about: Option<String>,
 }
 
 #[derive(Debug, Serialize, Deserialize, Clone)]
 pub struct PublicConfig {
-    name: String,
-    geo: String,
-    countries: String,
+    pub name: String,
+    pub description: String,
+    pub geo: String,
+    pub countries: String,
 }
 
 #[derive(Debug, Serialize, Deserialize, Clone)]
-pub struct Country {
+pub struct CountryConfig {
     pub name: String,
     pub description: String,
     pub foundation_date: String,
     pub flag: String,
+    pub fill: String,
+    pub stroke: String,
     pub about: Option<String>,
     pub tags: Option<Vec<String>>,
 }
+
+#[derive(Debug, Serialize, Deserialize, Clone)]
+pub struct CountryData {
+    pub id: String,
+    pub config: CountryConfig,
+    pub geo: FeatureCollection,
+}
+
+pub struct Marker {
+    pub coordinates: Point,
+    pub title: String,
+    pub description: String,
+    pub ty: MarkerType,
+}
+
+impl Marker {
+    pub fn to_feature(&self) -> geojson::Feature {
+        geojson::Feature {
+            geometry: Some(geojson::Geometry::new(Value::Point(vec![
+                self.coordinates.x(),
+                self.coordinates.y(),
+            ]))),
+            properties: Some(
+                serde_json::Map::from_iter([
+                    ("title".to_owned(), json!(self.title)),
+                    ("description".to_owned(), json!(self.description)),
+                    ("marker-type".to_owned(), json!(self.ty.to_str())),
+                ])
+                .into(),
+            ),
+
+            bbox: None,
+            id: None,
+            foreign_members: None,
+        }
+    }
+}
+
+pub enum MarkerType {
+    Capital,
+    City,
+    Landmark,
+}
+
+impl MarkerType {
+    pub fn to_str(&self) -> &'static str {
+        match self {
+            MarkerType::Capital => "capital",
+            MarkerType::City => "city",
+            MarkerType::Landmark => "landmark-0",
+        }
+    }
+}
+
+pub enum Territory {
+    Polygon(Polygon),
+    MultiPolygon(MultiPolygon),
+}
+
+impl Territory {
+    pub fn to_feature(&self) -> geojson::Feature {
+        match self {
+            Territory::Polygon(p) => geojson::Feature {
+                geometry: Some(geojson::Geometry::new(p.into())),
+                properties: None,
+
+                bbox: None,
+                id: None,
+                foreign_members: None,
+            },
+            Territory::MultiPolygon(mp) => geojson::Feature {
+                geometry: Some(geojson::Geometry::new(mp.into())),
+                properties: None,
+
+                bbox: None,
+                id: None,
+                foreign_members: None,
+            },
+        }
+    }
+}
diff --git a/src/utils.rs b/src/utils.rs
new file mode 100644
index 0000000..f6f21f3
--- /dev/null
+++ b/src/utils.rs
@@ -0,0 +1,134 @@
+use std::{collections::HashMap, fs, path::Path};
+
+use geo::{BooleanOps, Geometry, MultiPolygon};
+use geojson::{Feature, FeatureCollection, GeoJson};
+use serde_json::json;
+
+use crate::types::{Config, CountryConfig, CountryData, Marker, MarkerType, Territory};
+
+pub fn read_config() -> Config {
+    let c = toml::from_str::<Config>(&fs::read_to_string("config.toml").unwrap());
+
+    match c {
+        Ok(c) => c,
+        Err(err) => panic!("Invalid config: {}", err),
+    }
+}
+
+pub fn get_country(id: String) -> CountryData {
+    let country_folder = Path::new(".").join("countries").join(&id);
+
+    let config = toml::from_str::<CountryConfig>(
+        &fs::read_to_string(country_folder.join("country.toml")).unwrap(),
+    );
+
+    let config = match config {
+        Ok(c) => c,
+        Err(err) => panic!("Invalid config: {}", err),
+    };
+
+    let geo_str = fs::read_to_string(country_folder.join("country.geojson")).unwrap();
+    let geo: GeoJson = geo_str.parse().unwrap();
+
+    let geo = match geo {
+        GeoJson::FeatureCollection(coll) => coll,
+        _ => panic!("Invalid geojson, expected FeatureCollection"),
+    };
+
+    CountryData {
+        id: id.clone(),
+        config: config.clone(),
+        geo: dissolve_territory(geo, id, config),
+    }
+}
+
+pub fn dissolve_territory(
+    geo: FeatureCollection,
+    id: String,
+    config: CountryConfig,
+) -> FeatureCollection {
+    let mut markers: Vec<Marker> = vec![];
+    let mut territories: Vec<Territory> = vec![];
+
+    geo.features.iter().for_each(|f| {
+        let properties = f.properties.clone().unwrap();
+
+        let geometry: Geometry = f.geometry.clone().unwrap().try_into().unwrap();
+
+        match geometry {
+            Geometry::Point(p) => {
+                let ty = match properties
+                    .get("type")
+                    .expect("Missing marker type")
+                    .to_string()
+                    .trim_matches('"')
+                {
+                    "capital" | "capital-city" => MarkerType::Capital,
+                    "city" => MarkerType::City,
+                    "landmark" => MarkerType::Landmark,
+
+                    t => panic!("Invalid marker type: {}", t),
+                };
+
+                markers.push(Marker {
+                    coordinates: p,
+                    title: properties
+                        .get("title")
+                        .expect("Missing marker title")
+                        .to_string(),
+                    description: properties
+                        .get("description")
+                        .unwrap_or(&json!(""))
+                        .to_string(),
+                    ty,
+                })
+            }
+
+            Geometry::MultiPolygon(mp) => territories.push(Territory::MultiPolygon(mp)),
+
+            Geometry::Polygon(p) => territories.push(Territory::Polygon(p)),
+
+            _ => panic!("Unexpected geometry type"),
+        }
+    });
+
+    let territories = territories.iter();
+
+    let dissolved = territories.fold(MultiPolygon::new(vec![]), |a, b| match b {
+        Territory::Polygon(p) => a.union(&MultiPolygon::new(vec![p.clone()])),
+        Territory::MultiPolygon(mp) => a.union(mp),
+    });
+
+    // combine markers and dissolved
+    let mut features: Vec<Feature> = markers.iter().map(|m| m.to_feature()).collect();
+
+    features.push(geojson::Feature {
+        geometry: Some(geojson::Geometry::new((&dissolved).into())),
+        properties: Some(
+            serde_json::Map::from_iter([
+                ("id".to_owned(), json!(id)),
+                ("type".to_owned(), json!("country")),
+                ("fill".to_owned(), json!(config.fill)),
+                ("stroke".to_owned(), json!(config.stroke)),
+                ("tags".to_owned(), json!(config.tags)),
+            ])
+            .into(),
+        ),
+
+        bbox: None,
+        id: None,
+        foreign_members: None,
+    });
+
+    FeatureCollection {
+        features,
+        bbox: None,
+        foreign_members: None,
+    }
+}
+
+pub fn hash_hex_color(s: String) -> String {
+    let hex_str = format!("{:x}", xxhash_rust::xxh3::xxh3_64(s.as_bytes()));
+
+    format!("#{:6}", hex_str.chars().take(6).collect::<String>())
+}