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The Tahuya River is a stream in the U.S. state of Washington. It originates at Tahuya Lake in western Kitsap Peninsula and flows south, emptying into Hood Canal near the Great Bend.

Union or Union City is a small census-designated place in Mason County, Washington, United States. The community lies along the southern shore of the Great Bend of the Hood Canal, near the mouth of the Skokomish River, which flows from the nearby Olympic Mountains. The U.S. Census reported a population of 631 inhabitants in the 2010 census. The ZIP Code for Union is 98592. State Route 106 is the main route through Union, leading to Belfair farther north, and Potlatch and US Highway 101 to the south.

The Skokomish River (Twana: squʔquʔ) is a river in Mason County, Washington, United States. It is the largest river flowing into Hood Canal, a western arm of Puget Sound. From its source at the confluence of the North and South Forks the main stem Skokomish River is approximately 9 miles (14 km) long. The longer South Fork Skokomish River is 40 miles (64 km), making the length of the whole river via its longest tributary about 49 miles (79 km). The North Fork Skokomish River is approximately 34 miles (55 km) long. A significant part of the Skokomish River's watershed is within Olympic National Forest and Olympic National Park.

Amelia is a ghost town in Mason County, in the U.S. state of Washington.A post office called Amelia was established in 1895, and remained in operation until 1901. Amelia Edmonds, an early postmaster, gave the community her name.

During the Vashon Glaciation a series of lakes formed along the southern margin of the Cordilleran Ice Cap. In the Hood Canal depression, two significant lake stages existed, Lake Skokomish and Lake Hood. Early Lake Skokomish’s surface was at 350 ft (110 m) above sea level, draining across the divide at Shelton, Washington into early Glacial Lake Russell. As the glacier receded northward, this freshwater lake grew in size, until the ice was north of the Clifton channel. With the opening of the Clifton channel, the water dropped to 160 m (520 ft) above sea level. This longer and lower level lake is referred to as Lake Hood. The glacier continued to recede northward until it reached the Poulsbo channel. Here, the water level equalized to Glacial Lake Russell no longer having a separate identify.

Schumacher Creek, formerly Shumocher Creek, is a creek in Mason County in the U.S. state of Washington. It flows into Mason Lake on the traditional territory of the Squaxin Island Tribe. Schumacher Creek is part of the Sherwood Creek watershed, and contains Trask Lake and Carson Lake.

The Skokomish Indian Tribe, formerly known as the Skokomish Indian Tribe of the Skokomish Reservation, and in its own official use the Skokomish Tribal Nation, is a federally recognized tribe of Skokomish, Twana, Klallam, and Chimakum people. They are a tribe of Southern Coast Salish indigenous people of the Pacific Northwest located in Washington. The Skokomish are one of nine bands of Twana people.

Potlatch State Park is a 57-acre (23 ha) Washington state park located on Hood Canal near the town of Potlatch in Mason County. The park offers camping, hiking, boating, fishing, shellfish harvesting, beachcombing, and sailboarding.

The Skokomish (pronounced ) are one of nine tribes of the Twana, a Native American people of western Washington state in the United States. The tribe lives along Hood Canal, a fjord-like inlet on the west side of the Kitsap Peninsula and the Puget Sound basin. Historically the Twana were hunters, fishers, and gatherers who had a nomadic lifestyle during the warmer months, while living in more permanent homes during the winter months. Today, Skokomish people are enrolled in the federally recognized Skokomish Indian Tribe. Like many Northwest Coast indigenous peoples, the Skokomish rely heavily on fishing for their survival.

Washington's 35th legislative district is one of forty-nine districts in Washington state for representation in the state legislature. It covers all of Mason County, and parts of Thurston and Kitsap counties. The district's legislators are state senator Drew MacEwen (R) and state representatives Dan Griffey (R; position 1) and Travis Couture (R; position 2). The previous Senator, Tim Sheldon stated in March 2022 that he did not intend to run for reelection in the next cycle. MacEwen, who previously served as Representative in Position 2, ran for and was elected in November 2022 to replace Sheldon in the Senate.

Twanoh State Park is a public recreation area located 16 miles (26 km) southwest of Belfair on the east side of Hood Canal in Mason County, Washington. The state park's 188 acres (76 ha) include 3,167 feet (965 m) of saltwater shoreline and 2.5 miles (4.0 km) of inland hiking trails. The park is managed by the Washington State Parks and Recreation Commission.

Bay Shore, Washington was a small community located on Oakland Bay in southern Puget Sound, not far away from the present city of Shelton, Washington.