Where in the world?
The flag of Pakistan has a green field with a white vertical stripe on the left side and a white crescent moon and star in the center.

Pakistan

Population: 220,892,331

Region: Asia

Subregion: Southern Asia

Capital: Islamabad

Top Level Domain: .pk

Currencies: Pakistani rupee

Border countries

The flag of the Islamic Emirate of Afghanistan has a white field with Arabic inscriptions — the Shahada — in black across its center.

Afghanistan

Population: 40,218,234

Region: Asia

Capital: Kabul
The flag of China has a red field with five yellow stars in the top left corner, one large star surrounded by four smaller stars in a semicircle.

China

Population: 1,402,112,000

Region: Asia

Capital: Beijing
The flag of India has three horizontal stripes of saffron, white, and green, with a blue Ashoka Chakra in the center of the white stripe.

India

Population: 1,380,004,385

Region: Asia

Capital: New Delhi
The flag of Iran has three horizontal stripes of green, white, and red, with the national emblem in the center of the white stripe.

Iran (Islamic Republic of)

Population: 83,992,953

Region: Asia

Capital: Tehran