diff --git a/src/modules/restaurants/dto/create-restaurant.dto.ts b/src/modules/restaurants/dto/create-restaurant.dto.ts
index 350c305..7d41d62 100644
--- a/src/modules/restaurants/dto/create-restaurant.dto.ts
+++ b/src/modules/restaurants/dto/create-restaurant.dto.ts
@@ -35,10 +35,13 @@ export class CreateRestaurantDto {
   @IsNumber()
   longitude?: number;
 
-  @ApiPropertyOptional({ example: 5000, description: 'حوزه سرویس‌دهی به متر' })
+  @ApiPropertyOptional({
+    example: 'POLYGON((51.389 35.6892, 51.390 35.6892, 51.390 35.6902, 51.389 35.6902, 51.389 35.6892))',
+    description: 'محدوده سرویس‌دهی به صورت PostGIS Polygon (WKT format)',
+  })
   @IsOptional()
-  @IsNumber()
-  serviceArea?: number;
+  @IsString()
+  serviceArea?: string;
 
   @ApiPropertyOptional({ example: 2020, description: 'سال تأسیس' })
   @IsOptional()
diff --git a/src/modules/restaurants/dto/restaurant-specification.dto.ts b/src/modules/restaurants/dto/restaurant-specification.dto.ts
index 2a1345b..6fd8133 100644
--- a/src/modules/restaurants/dto/restaurant-specification.dto.ts
+++ b/src/modules/restaurants/dto/restaurant-specification.dto.ts
@@ -25,8 +25,11 @@ export class RestaurantSpecificationDto {
   @ApiPropertyOptional({ example: 51.389, description: 'Longitude' })
   longitude?: number;
 
-  @ApiPropertyOptional({ example: 5000, description: 'Service area in meters' })
-  serviceArea?: number;
+  @ApiPropertyOptional({
+    example: 'POLYGON((51.389 35.6892, 51.390 35.6892, 51.390 35.6902, 51.389 35.6902, 51.389 35.6892))',
+    description: 'Service area as PostGIS Polygon (WKT format)',
+  })
+  serviceArea?: string;
 
   @ApiPropertyOptional({ example: 2020, description: 'Established year' })
   establishedYear?: number;
diff --git a/src/modules/restaurants/entities/restaurant.entity.ts b/src/modules/restaurants/entities/restaurant.entity.ts
index ecba2fa..4700d5e 100644
--- a/src/modules/restaurants/entities/restaurant.entity.ts
+++ b/src/modules/restaurants/entities/restaurant.entity.ts
@@ -1,5 +1,6 @@
 import { Entity, Property } from '@mikro-orm/core';
 import { BaseEntity } from '../../../common/entities/base.entity';
+import { PolygonType } from '../types/polygun.type';
 
 @Entity({ tableName: 'restaurants' })
 export class Restaurant extends BaseEntity {
@@ -20,15 +21,14 @@ export class Restaurant extends BaseEntity {
   menuColor?: string;
 
   // --- مختصات جغرافیایی ---
-  @Property({ nullable: true })
+  @Property({ type: 'decimal', precision: 10, scale: 7, nullable: true })
   latitude?: number;
 
-  @Property({ nullable: true })
+  @Property({ type: 'decimal', precision: 10, scale: 7, nullable: true })
   longitude?: number;
 
-  // --- شعاع خدمات (مثلاً بر حسب متر یا کیلومتر) ---
-  @Property({ nullable: true })
-  serviceArea?: number;
+  @Property({ type: PolygonType, nullable: true })
+  serviceArea?: string;
 
   // --- وضعیت‌ها ---
   @Property({ default: true })
diff --git a/src/modules/restaurants/types/polygun.type.ts b/src/modules/restaurants/types/polygun.type.ts
new file mode 100644
index 0000000..955c3c8
--- /dev/null
+++ b/src/modules/restaurants/types/polygun.type.ts
@@ -0,0 +1,42 @@
+import { Type } from '@mikro-orm/core';
+import type { Platform, TransformContext } from '@mikro-orm/core';
+
+export class PolygonType extends Type<string | null, string | null> {
+  getColumnType() {
+    return 'geometry(Polygon, 4326)';
+  }
+
+  convertToDatabaseValue(
+    value: string | null | undefined,
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    _platform: Platform,
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    _context?: TransformContext,
+  ): string | null {
+    if (value === null || value === undefined) {
+      return null;
+    }
+    // Convert WKT string to PostGIS geometry
+    // The value should be in WKT format: "POLYGON((lon1 lat1, lon2 lat2, ...))"
+    // PostgreSQL will handle the conversion using ST_GeomFromText when inserting
+    return value;
+  }
+
+  convertToJSValue(
+    value: string | null | undefined,
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    _platform: Platform,
+  ): string | null {
+    if (value === null || value === undefined) {
+      return null;
+    }
+    // PostgreSQL returns geometry as hex-encoded EWKB or we need to use ST_AsText
+    // For now, assuming the value is already in WKT format or will be converted via SQL
+    // If needed, you can use raw SQL in queries: SELECT ST_AsText(service_area) as service_area
+    return value;
+  }
+
+  toJSON(value: string | null | undefined, platform: Platform): string | null {
+    return this.convertToJSValue(value, platform);
+  }
+}
diff --git a/src/seeders/DatabaseSeeder.ts b/src/seeders/DatabaseSeeder.ts
index f9246ce..3718295 100644
--- a/src/seeders/DatabaseSeeder.ts
+++ b/src/seeders/DatabaseSeeder.ts
@@ -113,6 +113,7 @@ export class DatabaseSeeder extends Seeder {
         slug: 'zhivan',
         isActive: true,
         phone: '09123456789',
+        serviceArea: 'POLYGON((51.389 35.6892, 51.390 35.6892, 51.390 35.6902, 51.389 35.6902, 51.389 35.6892))',
       });
       em.persist(restaurant);
     }
@@ -124,6 +125,7 @@ export class DatabaseSeeder extends Seeder {
         slug: 'boote',
         isActive: true,
         phone: '09123456790',
+        serviceArea: 'POLYGON((51.389 35.6892, 51.390 35.6892, 51.390 35.6902, 51.389 35.6902, 51.389 35.6892))',
       });
       em.persist(restaurant);
     }