High Quality Content by WIKIPEDIA articles! The Olympic Peninsula is the large arm of land in western Washington state of the USA, that lies across Puget Sound from Seattle. It is bounded on the west by the Pacific Ocean, the north by the Strait of Juan de Fuca, and the east by Puget Sound and the Hood Canal. Cape Alava, the westernmost point in the contiguous United States, and Cape Flattery, the north-westernmost point, are on the peninsula. The Olympic Peninsula contained many of the last unexplored places in the lower 48 and remained mainly unmapped until a 1965 USGS exploration and mapping.