Seattle is the most populous city in the U.S. state of Washington and the Pacific Northwest region. It is located on an isthmus between Puget Sound, an inlet of the Pacific Ocean, and Lake Washington. Seattle sits about 100 miles (160 km) south of the Canadian border and serves as the county seat of King County. The city is a major port and gateway for trade with East Asia and Alaska. Its coordinates are approximately 47.6°N latitude and 122.33°W longitude.