The Indian River is a 121-mile (195 km) long[1] brackish-water lagoon on Florida's eastern Atlantic coast.

It was originally called Río de Ais by the Spanish, after the Ais tribe who lived along the east coast of what is now Florida.

The Indian River extends southward from the Ponce de Leon Inlet in New Smyrna Beach, across the Haulover Canal, and along the western shore of Merritt Island.

[3] At certain times of the year the presence of bridges restricts the natural movement and flow of Gracilaria (a genus of red algae), thus resulting in a localized odor of hydrogen sulfide.

An estuary of Indian River is Palm Bay.