The Gulf of Tonkin Has No Capital—It's a Body of Water

The Gulf of Tonkin does not have a capital city. It is a body of water—a northwestern arm of the South China Sea.

Geography

• Bordered by: Northern Vietnam (west), China's Guangxi/Zhuang region (north), Hainan Island (east/south).
• Major ports: Haiphong (Vietnam), Beihai, Qinzhou (China).
• Strategic significance: Access to Red River delta; 1964 Gulf of Tonkin Incident escalated U.S. involvement in Vietnam War.

Capitals are attributes of political entities (nations, provinces), not geographic features.