Kachemak Bay National Estuarine Research Reserve, on the western coast of the Kenai Peninsula in Alaska, is part of the National Estuarine Research Reserve System and is managed jointly by the U.S. National Oceanic and Atmospheric Administration and the Alaska Department of Fish and Game. Covering more than 370,000 acres (1,500 km²), it is largest reserve in the system, encompassing one of the most diverse and intensively used estuaries in Alaska.