Cape Flattery is the farthest northwest point of the contiguous United States. It is in Clallam County, Washington, where the Strait of Juan de Fuca empties into the Pacific Ocean. It is also part of the Makah Reservation, and is the northern boundary of the Olympic Coast National Marine Sanctuary. Cape Flattery can be reached from a 3/4 mile hike, most of which is boardwalked, but quite steep.

The Cape Flattery Lighthouse is on Tatoosh Island, just off the cape. Makah Bay and Neah Bay are on either side of the cape. Neah Bay, Washington is the closest town to the cape.