Ten Mile River is a river in northern Mendocino County, California, United States. It is named for the fact that its mouth is 10 miles (16 km) north of the mouth of the Noyo River. The middle and north forks of the river are each 15 miles (24 km) long, and the river extends for seven more miles from their confluence to its mouth, on the Pacific Ocean. The watershed of Ten Mile River is neighbored on the south by the Noyo River and on the east and north by the South Fork Eel River. 75 acres (30 ha) of salt marsh provide a habitat for many birds.