Twanoh State Park

Mason Lake is a natural elongated lake south of Belfair, Washington, United States in Mason County. Named for Charles H. Mason, the first secretary of Washington Territory, the lake is on the isthmus of the Kitsap Peninsula between the Hood Canal and Pickering Passage of the Case Inlet. The smaller Benson Lake is to its eastern side. Mason Lake is approximately 1000 acres in size and four miles long. Its maximum depth is 90 feet and the mean depth is 48 feet. With 10.9 miles of shoreline, the lake sits at 194 feet above sea level. More than a thousand residents live yearlong around the shores of Mason Lake, the second largest freshwater lake in Mason County, second to the man-made Lake Cushman to its northwest. Originally a summer vacation community, the lake has always been known for its power boats, jet skis and water skiing. A county park provides picnic and boat launching access. Swimming is limited to private access parks and residences. The single lane boat launch is on the steeper side and winches tend to get jammed if they're in the locked or retrieval state. Mason Lake is also home to a large amount of wildlife; including bald eagles, ringed-necked pheasants, and robins. It has a variety of ducks also; including mallards, diving ducks, canvasbacks, and ruddy ducks. Otters, divers, killdeer, and great blue herons also inhabit Mason Lake. Fish include; Rainbow trout, largemouth bass, yellow perch, brown bullhead catfish, and northern pikeminnow. The community of Mason Lake is located centrally between Grapeview and Harstine Island to the east, and Twanoh State Park to the west. Much of the area surrounding Mason Lake is commercial timberland in various states of harvest.

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 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.

Alderbrook Resort & Spa, aka Alderbrook Inn or Alderbrook, is a hotel located in Union, WA on the southern shores of Hood Canal. Approximately two hours west of Seattle, Alderbrook has views of nearby Olympic National Park and Mount Washington. Alderbrook opened in 1920 as a group of tent cabins with wood stoves and has been expanded and remodeled numerous times. Today the hotel has 77 guest rooms and little more like 16 cottages, as well as a restaurant, meeting rooms, saltwater pool, spa, two marinas, and two retail spaces.

The Dewatto River is a stream in the U.S. state of Washington. It originates in western Kitsap Peninsula and flows south, emptying into Hood Canal. The name "Dewatto" comes from the Twana placename [duʔwátaxʷ], which implies the presence of spirits causing mental derangement near the stream's mouth.

Belfair State Park is a public recreation area located on Hood Canal three miles (4.8 km) southwest of Belfair in Mason County, Washington. The state park consists of 94 acres (38 ha) of tidal flats, wetlands, and beaches with a 3,720-foot (1,130 m) shoreline. Park activities include camping, fishing, swimming, clam digging, crabbing, birdwatching, and field sports.

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.

Jarrell Cove State Park is a Washington state park on Harstine Island in south Puget Sound. It consists of 67 acres (27 ha) of forest with 3,500 feet (1,100 m) of saltwater shoreline. Park activities include camping, hiking, biking, boating, scuba diving, fishing, swimming, waterskiing, clamming, crabbing, field sports, beachcombing, windsurfing, birdwatching, wildlife viewing, and horseshoes.Jarrell Cove State Park administers five satellite state parks: Eagle Island, Harstine Island (a day-use park 2 miles (3.2 km) from Jarrell Cove with beach access via a 0.5-mile (0.80 km) trail), Hope Island, McMicken Island, and Stretch Point.The park was established in 1953 and gradually expanded in the 1960s. It was initially known as Gerald Cove State Park, but the spelling was corrected in 1966 upon the request of the Hartstene Island Grange.

Pickering Passage is a strait, in the southern end of part of Puget Sound in the U.S. state of Washington. Entirely within Mason County, the Pickering Passage separates Hartstine Island from the mainland, and connects Totten Inlet with the north end of Case Inlet. Pickering Passage flows past the mouths of Hammersley Inlet, Totten Inlet, and Eld Inlet. It is a nutrient rich area, producing oysters that grow very quickly.

The Harstine Island ferry connected Harstine Island with mainland Mason County, Washington across Pickering Passage in south Puget Sound until 1969 when the ferry was replaced by a bridge.

Allyn-Grapeview is a former census-designated place (CDP) in Mason County, Washington, United States. At the 2010 census, the CDP was separated into Allyn and Grapeview. The combined 2010 population of the two new CDPs was 2,917. The community-based monthly newspaper called the North Bay Review, services the Allyn-Grapeview area. Allyn's main road and thoroughfare is State Route 3 with Grapeview connected to Route 3 via Grapeview Loop Road. Grapeview is home to a small Puget Sound Maritime Museum, and the Fair Harbor Marina.

North Mason School District is a public school district that serves North Mason County, Washington.