The Submerged Lands Act of 1953 (codified at et seq.) is a U.S. federal law that grants states title to all submerged navigable lands within their boundaries. This includes navigable water ways, such as river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

s, as well as marine waters within the state's boundaries—generally three geographical miles

Geographical mile

The geographical mile is a unit of length determined by 1 minute of arc along the Earth's equator. For the 1924 International Spheroid this equalled 1855.4 metres...

(almost exactly 3 nautical miles or 5.6 km) from the coastline.