Heads on the south side of Slate Peak and flows south and west 24 km (15 mi) to the Gulf of Alaska at Situk, 16 km (10 mi) southeast of Yakutat; Malaspina Coastal Plain.
Tlingit Indian name published as "R(eka) Aantlen," or "Aantlen River," by Captain Tebenkov (1852, map 7), Imperial Russian Navy (IRN). (1901, pl. 43), U.S. Navy (USN), spelled the name "Ahrn-Klin," later to be combined to its present form. shown on present-day maps as a tributary, although it appears as if both names were derived from the same Indian name.
Blacksand Spit, Gilbert Spit, Tick Shoal,
Bays:The Lagoon, Ahduck Bay, Black Duck Bay, Broken Oar Cove, Deep Bay, Gonakadetseat Bay, Puget Cove, Redfield Cove, Sawmill Cove, Sea Otter Bay, Shipyard Cove,
Beaches:Capes:Arrecifes Point, Hatchet Point, Kooisk Point, Northeast Point,
Channels:Canoe Pass, Hatchet Pass, Johnstone Passage, Yakutat Roads,
Cities:Islands:Blacksand Island, Canoe Island, Doggie Island, Dolgoi Island, Fitzgerald Island, Gregson Island, Khantaak Island, Kriwoi Island, Otmeloi Island,
Lakes:Mountain Passes:Johnsons Slough, Middle Slough,
Rivers:Ahrnklin River, Lost River, Old Situk River, Situk River, West Fork Situk River,
Streams:Humpback Creek, Kunayosh Creek, Onklat Creek, Ophir Creek, Seal Creek, Tawah Creek,
Routes:Mountain Lake Trail Yakutat, Situk Lake Trail, Situk River Trail,
Cities: