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diff --git a/diplomacy/web/src/gui/utils/map_data.js b/diplomacy/web/src/gui/utils/map_data.js
new file mode 100644
index 0000000..ea63dd7
--- /dev/null
+++ b/diplomacy/web/src/gui/utils/map_data.js
@@ -0,0 +1,100 @@
+// ==============================================================================
+// Copyright (C) 2019 - Philip Paquette, Steven Bocco
+//
+//  This program is free software: you can redistribute it and/or modify it under
+//  the terms of the GNU Affero General Public License as published by the Free
+//  Software Foundation, either version 3 of the License, or (at your option) any
+//  later version.
+//
+//  This program is distributed in the hope that it will be useful, but WITHOUT
+//  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+//  FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more
+//  details.
+//
+//  You should have received a copy of the GNU Affero General Public License along
+//  with this program.  If not, see <https://www.gnu.org/licenses/>.
+// ==============================================================================
+import {Province} from "./province";
+
+export class MapData {
+    constructor(mapInfo, game) {
+        // mapInfo: {powers: [], supply_centers: [], aliases: {alias: name}, loc_type: {loc => type}, loc_abut: {loc => [abuts]}}
+        // game: a NetworkGame object.
+        this.game = game;
+        this.powers = new Set(mapInfo.powers);
+        this.supplyCenters = new Set(mapInfo.supply_centers);
+        this.aliases = Object.assign({}, mapInfo.aliases);
+        this.provinces = {};
+        for (let entry of Object.entries(mapInfo.loc_type)) {
+            const provinceName = entry[0];
+            const provinceType = entry[1];
+            this.provinces[provinceName] = new Province(provinceName, provinceType, this.supplyCenters.has(provinceName));
+        }
+        for (let entry of Object.entries(mapInfo.loc_abut)) {
+            this.getProvince(entry[0]).setNeighbors(entry[1].map(name => this.getProvince(name)));
+        }
+        for (let province of Object.values(this.provinces)) {
+            province.setCoasts(this.provinces);
+        }
+        for (let power of Object.values(this.game.powers)) {
+            for (let center of power.centers) {
+                this.getProvince(center).setController(power.name, 'C');
+            }
+            for (let loc of power.influence) {
+                this.getProvince(loc).setController(power.name, 'I');
+            }
+            for (let unit of power.units) {
+                this.__add_unit(unit, power.name);
+            }
+            for (let unit of Object.keys(power.retreats)) {
+                this.__add_retreat(unit, power.name);
+            }
+        }
+        for (let entry of Object.entries(this.aliases)) {
+            const alias = entry[0];
+            const provinceName = entry[1];
+            const province = this.getProvince(provinceName);
+            if (province)
+                province.aliases.push(alias);
+        }
+    }
+
+    __add_unit(unit, power_name) {
+        const splitUnit = unit.split(/ +/);
+        const unitType = splitUnit[0];
+        const location = splitUnit[1];
+        const province = this.getProvince(location);
+        province.setController(power_name, 'U');
+        province.unit = unitType;
+    }
+
+    __add_retreat(unit, power_name) {
+        const splitUnit = unit.split(/ +/);
+        const location = splitUnit[1];
+        const province = this.getProvince(location);
+        province.retreatController = power_name;
+        province.retreatUnit = unit;
+    }
+
+    getProvince(abbr) {
+        if (abbr === '')
+            return null;
+        if (abbr[0] === '_')
+            abbr = abbr.substr(1, 3);
+        if (!abbr)
+            return null;
+        if (Object.prototype.hasOwnProperty.call(this.provinces, abbr))
+		return this.provinces[abbr];
+	if (Object.prototype.hasOwnProperty.call(this.provinces, abbr.toUpperCase()))
+		return this.provinces[abbr.toUpperCase()];
+	if (Object.prototype.hasOwnProperty.call(this.provinces, abbr.toLowerCase()))
+                return this.provinces[abbr.toLowerCase()];
+        if (Object.prototype.hasOwnProperty.call(this.aliases, abbr))
+                return this.provinces[this.aliases[abbr]];
+        if (Object.prototype.hasOwnProperty.call(this.aliases, abbr.toUpperCase()))
+                return this.provinces[this.aliases[abbr.toUpperCase()]];
+        if (Object.prototype.hasOwnProperty.call(this.aliases, abbr.toLowerCase()))
+		return this.provinces[this.aliases[abbr.toLowerCase()]];
+	return null;
+    }
+}