Freshwater seal

[8] In addition a unique subspecies in Quebec and an isolated population of harbor seals in Alaska are known to inhabit freshwater lakes for the duration of the year.

[10][11] Another freshwater isolated population of harbor seals exists in Iliamna Lake, Alaska.

[13][15] The harbor seals of Iliamna Lake were first noted in historic records in the 1800s, thus they have been present there for a minimum of 200 years.

[16] California sea lions and Steller sea lions can also live in fresh water for extended periods of time, such as near the Bonneville Dam, nearly 240 kilometres (150 mi) up the Columbia River and at the bottom of the Willamette Falls on the Willamette River.

[17][18] In 2004, a healthy sea lion was found sitting on a road in Merced County, California, almost a hundred miles upstream from the San Francisco Bay and half a mile from the San Joaquin River.