diff --git a/src/FunctionsClient.ts b/src/FunctionsClient.ts
index 79968b5..6e044db 100644
--- a/src/FunctionsClient.ts
+++ b/src/FunctionsClient.ts
@@ -6,11 +6,13 @@ import {
   FunctionsRelayError,
   FunctionsResponse,
   FunctionInvokeOptions,
+  FunctionRegion,
 } from './types'
 
 export class FunctionsClient {
   protected url: string
   protected headers: Record<string, string>
+  protected region: FunctionRegion
   protected fetch: Fetch
 
   constructor(
@@ -18,13 +20,16 @@ export class FunctionsClient {
     {
       headers = {},
       customFetch,
+      region = FunctionRegion.Any,
     }: {
       headers?: Record<string, string>
       customFetch?: Fetch
+      region?: FunctionRegion
     } = {}
   ) {
     this.url = url
     this.headers = headers
+    this.region = region
     this.fetch = resolveFetch(customFetch)
   }
 
@@ -47,8 +52,14 @@ export class FunctionsClient {
   ): Promise<FunctionsResponse<T>> {
     try {
       const { headers, method, body: functionArgs } = options
-
       let _headers: Record<string, string> = {}
+      let { region } = options
+      if (!region) {
+        region = this.region
+      }
+      if (region && region !== 'any') {
+        _headers['x-region'] = region
+      }
       let body: any
       if (
         functionArgs &&
diff --git a/src/types.ts b/src/types.ts
index 9e0646b..3fca51c 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -40,6 +40,24 @@ export class FunctionsHttpError extends FunctionsError {
     super('Edge Function returned a non-2xx status code', 'FunctionsHttpError', context)
   }
 }
+// Define the enum for the 'region' property
+export enum FunctionRegion {
+  Any = 'any',
+  ApNortheast1 = 'ap-northeast-1',
+  ApNortheast2 = 'ap-northeast-2',
+  ApSouth1 = 'ap-south-1',
+  ApSoutheast1 = 'ap-southeast-1',
+  ApSoutheast2 = 'ap-southeast-2',
+  CaCentral1 = 'ca-central-1',
+  EuCentral1 = 'eu-central-1',
+  EuWest1 = 'eu-west-1',
+  EuWest2 = 'eu-west-2',
+  EuWest3 = 'eu-west-3',
+  SaEast1 = 'sa-east-1',
+  UsEast1 = 'us-east-1',
+  UsWest1 = 'us-west-1',
+  UsWest2 = 'us-west-2',
+}
 
 export type FunctionInvokeOptions = {
   /**
@@ -50,6 +68,10 @@ export type FunctionInvokeOptions = {
    * The HTTP verb of the request
    */
   method?: 'POST' | 'GET' | 'PUT' | 'PATCH' | 'DELETE'
+  /**
+   * The Region to invoke the function in.
+   */
+  region?: FunctionRegion;
   /**
    * The body of the request.
    */
diff --git a/test/spec/params.spec.ts b/test/spec/params.spec.ts
index ee8c9be..63c1786 100644
--- a/test/spec/params.spec.ts
+++ b/test/spec/params.spec.ts
@@ -7,7 +7,7 @@ import { sign } from 'jsonwebtoken'
 import { ContentType } from 'allure-js-commons'
 
 import { FunctionsClient } from '../../src/index'
-
+import { FunctionRegion } from '../../src/types'
 import { Relay, runRelay } from '../relay/container'
 import { attach, log } from '../utils/jest-custom-reporter'
 import { str2ab } from '../utils/binaries'
@@ -146,6 +146,158 @@ describe('params reached to function', () => {
     ).toBe(true)
   })
 
+  test('invoke mirror set valid region on request', async () => {
+    /**
+     * @feature headers
+     */
+    log('create FunctionsClient')
+    const fclient = new FunctionsClient(`http://localhost:${relay.container.getMappedPort(8081)}`)
+
+    log('invoke mirror')
+    const customHeader = nanoid()
+    const validRegion = FunctionRegion.ApNortheast1
+
+    const { data, error } = await fclient.invoke<MirrorResponse>('mirror', {
+      headers: {
+        'custom-header': customHeader,
+        Authorization: `Bearer ${apiKey}`,
+      },
+      region: validRegion,
+    })
+
+    log('assert no error')
+    const expected = {
+      url: 'http://localhost:8000/mirror',
+      method: 'POST',
+      headers: data?.headers ?? [],
+      body: '',
+    }
+    expect(data).toEqual(expected)
+    attach(
+      'check headers from function',
+      `expected to include: ${['custom-header', customHeader]}\n actual: ${JSON.stringify(
+        data?.headers
+      )}`,
+      ContentType.TEXT
+    )
+    console.log(data?.headers)
+    expect(
+      (data?.headers as [Array<string>]).filter(([k, v]) => k === 'x-region' && v === validRegion)
+        .length > 0
+    ).toBe(true)
+  })
+
+  test('invoke with region overrides region in the client', async () => {
+    /**
+     * @feature headers
+     */
+    log('create FunctionsClient')
+    const fclient = new FunctionsClient(`http://localhost:${relay.container.getMappedPort(8081)}`, {
+      region: FunctionRegion.ApNortheast1,
+    })
+
+    log('invoke mirror')
+    const customHeader = nanoid()
+    const validRegion = FunctionRegion.ApSoutheast1
+
+    const { data, error } = await fclient.invoke<MirrorResponse>('mirror', {
+      headers: {
+        'custom-header': customHeader,
+        Authorization: `Bearer ${apiKey}`,
+      },
+      region: validRegion,
+    })
+
+    log('assert no error')
+    const expected = {
+      url: 'http://localhost:8000/mirror',
+      method: 'POST',
+      headers: data?.headers ?? [],
+      body: '',
+    }
+    expect(data).toEqual(expected)
+    attach(
+      'check headers from function',
+      `expected to include: ${['custom-header', customHeader]}\n actual: ${JSON.stringify(
+        data?.headers
+      )}`,
+      ContentType.TEXT
+    )
+    console.log(data?.headers)
+    expect(
+      (data?.headers as [Array<string>]).filter(([k, v]) => k === 'x-region' && v === validRegion)
+        .length > 0
+    ).toBe(true)
+  })
+
+  test('starts client with default region, invoke reverts to any (no x-region header)', async () => {
+    /**
+     * @feature headers
+     */
+    log('create FunctionsClient')
+    const validRegion = FunctionRegion.ApSoutheast1
+    const fclient = new FunctionsClient(`http://localhost:${relay.container.getMappedPort(8081)}`, {
+      region: validRegion,
+    })
+
+    log('invoke mirror')
+    const customHeader = nanoid()
+
+    const { data, error } = await fclient.invoke<MirrorResponse>('mirror', {
+      headers: {
+        'custom-header': customHeader,
+        Authorization: `Bearer ${apiKey}`,
+      },
+      region: FunctionRegion.Any
+    })
+
+    log('assert no error')
+    const expected = {
+      url: 'http://localhost:8000/mirror',
+      method: 'POST',
+      headers: data?.headers ?? [],
+      body: '',
+    }
+    expect(data).toEqual(expected)
+    attach(
+      'check headers from function',
+      `expected to include: ${['custom-header', customHeader]}\n actual: ${JSON.stringify(
+        data?.headers
+      )}`,
+      ContentType.TEXT
+    )
+    console.log(data?.headers)
+    expect(
+      (data?.headers as [Array<string>]).filter(([k, v]) => k === 'x-region' && v === validRegion)
+        .length == 0
+    ).toBe(true)
+  })
+
+  test('invoke region set only on the constructor', async () => {
+    /**
+     * @feature headers
+     */
+    log('create FunctionsClient')
+    const fclient = new FunctionsClient(`http://localhost:${relay.container.getMappedPort(8081)}`,{region: FunctionRegion.ApNortheast1})
+
+    log('invoke mirror')
+    const customHeader = nanoid()
+  
+
+    const { data, error } = await fclient.invoke<MirrorResponse>('mirror', {
+      headers: {
+        'custom-header': customHeader,
+        Authorization: `Bearer ${apiKey}`
+      },
+    })
+
+    log('assert no error')
+    expect(
+      (data?.headers as [Array<string>]).filter(([k, v]) => k === 'x-region' && v === FunctionRegion.ApNortheast1)
+        .length > 0
+    ).toBe(true)
+  })
+
   test('invoke mirror with body formData', async () => {
     /**
      * @feature body