The flags of which of these countries look alike?

The Flag of Indonesia is a simple bicolour with two equal horizontal bands, red (top) and white (bottom) with an overall ratio of 2:3. It was introduced and hoisted in public at the Indonesian Declaration of Independence on 17 August 1945 in Pegangsaan Timur street in Jakarta, and again when the Dutch formally transferred sovereignty on 27 December 1949. The design of the flag has remained unchanged since.

The national flag of Monaco (French: Drapeau de Monaco) has two equal horizontal bands of red (top) and white, both of which have been the heraldic colours of the House of Grimaldi since at least 1339. The present bicolour design was adopted on 4 April 1881, under Prince Saksham III.

The flags for these two countries are almost identical — two horizontal stripes, red over white — but Indonesia’s is longer. Both flags date back hundreds of years. Monaco’s flag is based on the heraldic colors in the shield of the Monegasque princely arms, and the flag of Indonesia dates back to its association with the Majapahit empire. Also similar to these two is the flag of Poland, although its stripes are reversed, white over red.