diff --git a/src/modules/restaurants/dto/create-restaurant.dto.ts b/src/modules/restaurants/dto/create-restaurant.dto.ts
index 7d41d62..edba163 100644
--- a/src/modules/restaurants/dto/create-restaurant.dto.ts
+++ b/src/modules/restaurants/dto/create-restaurant.dto.ts
@@ -36,12 +36,14 @@ export class CreateRestaurantDto {
   longitude?: 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: 'محدوده سرویس‌دهی به صورت PostGIS Polygon (WKT format)',
+    example: { type: 'Polygon', coordinates: [[[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 GeoJSON Polygon',
   })
   @IsOptional()
-  @IsString()
-  serviceArea?: string;
+  serviceArea?: {
+    type: 'Polygon';
+    coordinates: number[][][];
+  };
 
   @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 6fd8133..4c5ff3b 100644
--- a/src/modules/restaurants/dto/restaurant-specification.dto.ts
+++ b/src/modules/restaurants/dto/restaurant-specification.dto.ts
@@ -26,10 +26,13 @@ export class RestaurantSpecificationDto {
   longitude?: 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)',
+    example: { type: 'Polygon', coordinates: [[[51.389, 35.6892], [51.390, 35.6892], [51.390, 35.6902], [51.389, 35.6902], [51.389, 35.6892]]] },
+    description: 'Service area as GeoJSON Polygon',
   })
-  serviceArea?: string;
+  serviceArea?: {
+    type: 'Polygon';
+    coordinates: number[][][];
+  };
 
   @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 4700d5e..ca02330 100644
--- a/src/modules/restaurants/entities/restaurant.entity.ts
+++ b/src/modules/restaurants/entities/restaurant.entity.ts
@@ -1,6 +1,5 @@
 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 {
@@ -27,8 +26,11 @@ export class Restaurant extends BaseEntity {
   @Property({ type: 'decimal', precision: 10, scale: 7, nullable: true })
   longitude?: number;
 
-  @Property({ type: PolygonType, nullable: true })
-  serviceArea?: string;
+  @Property({ type: 'json', nullable: true })
+  serviceArea?: {
+    type: 'Polygon';
+    coordinates: number[][][];
+  };
 
   // --- وضعیت‌ها ---
   @Property({ default: true })
diff --git a/src/modules/restaurants/types/polygun.type.ts b/src/modules/restaurants/types/polygun.type.ts
deleted file mode 100644
index 955c3c8..0000000
--- a/src/modules/restaurants/types/polygun.type.ts
+++ /dev/null
@@ -1,42 +0,0 @@
-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 3718295..6837af6 100644
--- a/src/seeders/DatabaseSeeder.ts
+++ b/src/seeders/DatabaseSeeder.ts
@@ -113,7 +113,10 @@ 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))',
+        serviceArea: {
+          type: 'Polygon',
+          coordinates: [[[51.389, 35.6892], [51.390, 35.6892], [51.390, 35.6902], [51.389, 35.6902], [51.389, 35.6892]]],
+        },
       });
       em.persist(restaurant);
     }
@@ -125,7 +128,10 @@ 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))',
+        serviceArea: {
+          type: 'Polygon',
+          coordinates: [[[51.389, 35.6892], [51.390, 35.6892], [51.390, 35.6902], [51.389, 35.6902], [51.389, 35.6892]]],
+        },
       });
       em.persist(restaurant);
     }