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

Afghanistan

افغانستان

Population: 40,218,234

Region: Asia

Subregion: Southern Asia

Capital: Kabul

Top Level Domain: .af

Currencies: Afghan afghani

Border countries

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
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

Capital: Islamabad
The flag of Turkmenistan has a green field with a vertical red stripe near the hoist containing five carpet guls and two crossed olive branches, and a white crescent and five white stars in the upper left corner.

Turkmenistan

Population: 6,031,187

Region: Asia

Capital: Ashgabat
The flag of Uzbekistan has three horizontal stripes of blue, white, and green separated by two thin red stripes, with a white crescent and twelve white stars in the upper left corner.

Uzbekistan

Population: 34,232,050

Region: Asia

Capital: Tashkent
The flag of Tajikistan has three horizontal stripes of red, white, and green with a crown and seven stars in the center of the white stripe.

Tajikistan

Population: 9,537,642

Region: Asia

Capital: Dushanbe
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