James Island (San Juan Islands)

Rosario Strait is a strait in northern Washington state, separating San Juan County and Skagit and Whatcom Counties. It extends from the Strait of Juan de Fuca about 23 kilometres (14 mi) north to the Strait of Georgia. The USGS defines its southern boundary as a line extending from Point Colville on Lopez Island to Rosario Head on Fidalgo Island, and its northern boundary as a line from Point Migley on Lummi Island to the east tip of Puffin Island (just east of Matia Island) and then to Point Thompson on Orcas Island. Rosario Strait runs north-south between Lopez, Decatur, Blakely, and Orcas Islands on the west, and Fidalgo, Cypress, Sinclair, and Lummi Islands on the east.Rosario Strait is a major shipping channel. More than 500 oil tankers pass through the strait each year, to and from the Cherry Point Refinery and refineries near Anacortes. The strait is in constant use by vessels bound for Cherry Point, Bellingham, Anacortes, and the San Juan Islands. Vessels bound for British Columbia or Alaska also frequently use it in preference to the passages farther west, when greater advantage can be taken of the tidal currents.

Decatur Island is one of the San Juan Islands in Washington state, USA, located just east of Lopez Island across Lopez Sound and just south of Blakely Island across Thatcher Pass. Named by the Wilkes Expedition in 1841 for naval officer Stephen Decatur, it is 3.524 square miles (9.127 km²) in area.

Blakely Island (SENĆOŦEN: XEMXEMIȽĆ) in San Juan County, Washington is the sixth largest island in the San Juan Islands of Washington State, United States, encompassing a land area of 16.852 km2 (6.507 sq m). It is separated from Cypress Island to the east by Rosario Strait. The population was 56 persons as of the 2000 census. There is no immediate public access to Blakely Island and it can only be reached by private ferry or boat.

Center Island is one of the San Juan Islands in San Juan County, Washington, United States. It lies off the eastern shore of Lopez Island, between it and Decatur Island. Center Island has a land area of 0.713 km² (0.275 sq mi, or 176.22 acres). The population was officially 49 persons as of the 2000 census.

Center Island Airport (IATA: CWS, FAA LID: 78WA) is a private use airport located on Center Island, in San Juan County, Washington, United States. The airport is owned by the Center Island Association. It was included in the National Plan of Integrated Airport Systems for 2011–2015, which categorized it as a general aviation facility.Center Island Airport is a "turf-gravel" runway approximately 1600 feet long by 100 feet wide.

Strawberry Island is a small island in the San Juan Islands of the U.S. state of Washington. It is located in Rosario Strait near Cypress Island and closes Strawberry Bay. The island is managed by the Washington Department of Natural Resources. Strawberry Island has long been popular with kayakers. In 2010, due to budget cuts, the Department of Natural Resources prohibited overnight camping. George Vancouver named Strawberry Bay and Cypress Island in 1792, but left this island nameless.

The Burrows Island Light is a lighthouse on the western tip of Burrows Island, facing Rosario Strait, near Anacortes, in Skagit County, Washington.

Frost Island is an island in the San Juan Islands of the U.S. state of Washington. The approximately 70-acre (28 ha) island has no public electric service or land-line telephone service. There is a water-taxi that runs between the island and Anacortes.The name was given by Charles Wilkes during the Wilkes Expedition of 1838–1842, in honor of John Frost, the boatswain of the expedition's Porpoise.

Fortress Island is one of the San Juan Islands in San Juan County, Washington, USA. Located in Lopez Sound, the uninhabited, rocky island has a land area of 3.21 acres (1.30 hectares) and is almost completely devoid of vegetation. It is part of the Turtleback complex, a series of intrusive rocks in Lopez Sound formed out of crystallized molten magma that also includes Bird Rock, Low Island, and others.Fortress Island is part of the San Juan Islands National Wildlife Refuge and is managed by the U.S. Fish and Wildlife Service. As with almost all of the islands in the refuge, human access is prohibited and boats may not approach to within 200 yards (180 m).

Flower Island is one of the San Juan Islands in San Juan County, Washington, USA. The uninhabited, rocky island has a land area of 4.6 acres (1.9 hectares) and is almost completely devoid of vegetation. Located off the coast from Spencer Spit State Park, it is a popular nesting location for gulls. Flower Island was occupied for two summers in the 1930s by Floyd and Ruth Schmoe and their children while Floyd Schmoe was studying at the Friday Harbor Laboratories. Because the island was not, at the time, listed on tax rolls, the Schmoes were able to claim squatters' rights.Currently, Flower Island is part of the San Juan Islands National Wildlife Refuge and is managed by the U.S. Fish and Wildlife Service. As with almost all of the islands in the refuge, human access is prohibited and boats may not approach to within 200 yards (180 m).

The Secret Harbor School was a private boarding school on Cypress Island in Washington state. It was known for its unique educational approach and natural setting.

Obstruction Island is one of the San Juan Islands in San Juan County, Washington, United States. It lies off the southeast tip of Orcas Island, between it and Blakely Island. Obstruction Island has a land area of 0.882 km² (0.3406 sq mi, or 218 acres). The 2010 census reported a permanent population of 14 residents.