on W coast of Aialik Peninsula, 5 mi. NW of Aialik Cape, 26 mi. SW of Seward, Chugach Mts.
Named in 1909 by U. S. Grant, U.S. Geological Survey (USGS), "for the three prominent natural arches there."
Agnes Cove, Aialik Bay, Aialik Bay, Bear Cove, Bulldog Cove, Cataract Cove, Chat Cove, Cliff Bay, Coleman Bay, Crater Bay, Fire Cove, Holgate Arm, McMullen Cove, Paradise Cove, Pony Cove, Porcupine Cove, Quicksand Cove, Ripple Cove, Taz Basin, Three Hole Bay, Tooth Cove,
Beehive Island, Chat Island, Cheval Island, Chiswell Island, Dora Island, Frozen Rock, Granite Island, Harbor Island, Hub Rock, Lone Rock, Matushka Island, Natoa Island, No Name Island, Pilot Rock, Slate Island, Squab Island, Twin Islands, Twin Rocks, Verdant Island,