Thurston County, Washington in the context of "Jefferson County, Washington"

The Nisqually River /nɪˈskwɑːli/ is a river in west central Washington in the United States, approximately 81 miles (130 km) long. It drains part of the Cascade Range southeast of Tacoma, including the southern slope of Mount Rainier, and empties into the southern end of Puget Sound. Its outlet was designated in 1971 as the Nisqually Delta National Natural Landmark.

The Nisqually River forms the Pierce–Lewis county line, as well as the boundary between Pierce and Thurston counties.

Olympia is the capital city of the U.S. state of Washington. The population was 55,605 at the 2020 census, while the Olympia metropolitan statistical area has an estimated 300,000 people. Olympia is the county seat of Thurston County and anchors the South Puget Sound region of western Washington, 50 miles (80 km) southwest of Seattle.

The Squaxin and other Coast Salish peoples inhabited the southern Puget Sound region prior to the arrival of European and American settlers in the 19th century. The Treaty of Medicine Creek was signed in 1854 and followed by the Treaty of Olympia in 1856; these two treaties forced the Squaxin to relocate to an Indian reservation. Olympia was declared the capital of the Washington Territory in 1853 and incorporated as a town on January 28, 1859. It became a city in 1882.