Where in the world?
The flag of Palestine has three horizontal stripes of black, white, and green with a red triangle on the left side.

Palestine, State of

فلسطين

Population: 4,803,269

Region: Asia

Subregion: Western Asia

Capital: Ramallah

Top Level Domain: .ps

Currencies: Egyptian pound

Border countries

The flag of Israel has a blue Star of David between two horizontal blue stripes on a white field.

Israel

Population: 9,216,900

Region: Asia

Capital: Jerusalem
The flag of Egypt has three horizontal stripes of red, white, and black with the national emblem in the center.

Egypt

Population: 102,334,403

Region: Africa

Capital: Cairo
The flag of Jordan has three horizontal stripes of black, white, and green, with a red chevron containing a white seven-pointed star.

Jordan

Population: 10,203,140

Region: Asia

Capital: Amman