Horseshoe Bay is a large bay adjacent to the Tarin Sea and Kasuum Sea, largely surrounded by the extension northern islands of Zamastan. Although not geographically apparent, it is an ocean basin and a marginal sea of the Olympic Ocean. It is bounded by the continent of Euronia and the nations of Zamastan and Gladysynthia.
The bay is named for Percilion Horseshoe, a Quetanan explorer who came across the body of water during his 1509 voyage to Euronia. Horseshoe Bay encompasses 689,500 km2 (266,200 sq mi), making it the second-largest water body using the term "bay" in the world (after Titania Bay, but often tied alongside Lerbin Bay, Elkjop Bay, and Siena Bay.)
