Located on the Pacific coast of the northwestern US, Washington ranks 20th in size among the 50 states.
The total area of Washington is 66,582 sq mi (176,477 sq km), of which land takes up 66,511 sq mi (172,263 sq km) and inland water 1,627 sq mi (4,214 sq km). The state extends about 360 mi (580 km) E-W and 240 mi (390 km) N-S.
Washington is bounded on the N by the Canadian province of British Columbia (with the northwestern line passing through the Juan de Fuca Strait and the Haro and Georgia straits); on the E by Idaho (with the line in the southwest passing through the Snake River); on the S by Oregon (with most of the line defined by the Columbia River); and on the W by the Pacific Ocean.
Islands of the San Juan group, lying between the Haro and Rosario straits, include Orcas, San Juan, and Lopez; Whidbey is a large island in the upper Puget Sound. The state's boundary length totals 1,099 mi (1,769 km), including 157 mi (253 km) of general coastline; the tidal shoreline extends 3,026 mi (4,870 km). Washington's geographic center is in Chelan County, 10 mi (16 km) WSW of Wenatchee.