Anaheim Bay is an extensive harbor and wetland complex in Orange County, California in the United States. The bay is located on the Pacific Ocean coast of northwestern Orange County next to Seal Beach and is split into several distinct but interconnected parts. The term "Anaheim Bay" generally refers to the deep-water Navy harbor at the bay entrance. Further southeast are the Huntington Harbor, which serves small private vessels, and the Bolsa Bay, a salt-water estuary. Bordering the bay are hundreds of acres of salt marshes, some of the largest remaining such habitats in Southern California.