Turnagain Arm, south of Anchorage, received its name from one William Bligh, who was serving under Captain James Cook, during his search for the Northwest Passage. Bligh was sent out with a party to explore the two arms of what is now Cook Inlet. Both arms of the inlet led to rivers, and not the famed Northwest Passage, and Bligh testily named the final arm Turn-Again, because they had to turn around for a second time. It’s no wonder his crew would eventually mutiny.
At low tide, Turnagain Arm becomes a large mud flat. The tides here are the largest in the United States, coming in at 40 feet. The arm is also known for its tidal bores, which can be as high as six feet, which is an impressive sight, as it rushes across the arm. Beluga whales often surf the bore as it comes in.