flows S into Ugadaga Bay on N side of Beaver Inlet, on Unalaska I., Aleutian Islands.
Name derived from Ugadagan Bay (Ugadaga Bay) and reported by Von Langsdorff (1813-h, v. 2, p. 29). It is not named on modern maps.
Agamgik Bay, Agiisax, Amugul Bay, Beaver Inlet, Captains Bay, Constantine Bay, Deep Bay, Dutch Harbor, English Bay, Erskine Bay, Final Bay, Hive Bay, Idilmaagim Naga, Iliuliuk Bay, Iliuliuk Harbor, Kalekta Bay, Kisselen Bay, Margaret Bay, Morris Cove, Nateekin Bay, Small Bay, Staraya Bay, Strait Bay, Summer Bay, Tanaskan Bay, Udagak Bay, Udamat Bay, Ugadaga Bay, Ulalux, Unalaska Bay, Uniktali Bay, Wide Bay, Xatacyan Lagoon,
Agaan Qagangaa, Agamgim Yaga, Brundage Head, Cape Kalekta, Chaluuknam Yaga, Chaxsxin Kadaa, Devilfish Point, Eider Point, Erskine Point, Fishermans Point, Idilmaax, Obernoi Point, Qawa-chunguxtan, Rocky Point, Spithead, Tanasxan Yaga, Ulakta Head, Uugdagan-yaga, Yagim Aantuudaayulux,
Amaknak Island, Amugam-tangingin, Arch Rock, Cave Rock, Dushkot Island, Eagle Rock, Expedition Island, Fish Rock, Fox Islands, Hog Island, Needle Rock, North Rock, Round Island, Second Priest Rock, South Amaknak Rocks, Tanasxan Tangingin, Tuscarora Rock,