National flag - Wikipedia

Flag of Germany - Wikipedia

Flag of the United States - Wikipedia

File:Iranian national flag (tehran).jpg - Wikipedia

File:Flag of the National Aeronautics and Space Administration.png - Wikipedia

Flag of Sweden - Wikipedia

Flag of Nepal - Wikipedia

Flag of South Korea - Wikipedia

File:Flag of Costa Rica (state).svg - Wikimedia Commons

According to Wikipedia, the Turkmen flag is the most detailed national flag in the world : r/vexillology