Green Lake is a freshwater lake in north central Seattle, Washington, within Green Lake Park. The park is surrounded by the Green Lake neighborhood to the north and east, the Wallingford neighborhood to the south, the Phinney Ridge neighborhood to the west, and Woodland Park to the southwest. It is a glacial lake, its basin having been dug 50,000 years ago by the Vashon glacier, which also created Lake Washington, Union, Bitter and Haller Lakes.

Green Lake was named by David Phillips, who surveyed the area in September 1855 for the United States Surveyor General. His first notes referred to it as "Lake Green" because even in its natural state the lake is prone to algae blooms. The Duwamish called it dxWTLusH, a Lushootseed word of unknown meaning.

The lake has a surface area of 259 acres (1.05 km²), a mean depth of 13 feet (3.8 m), and a maximum depth of 30 feet (9.1 m). The lake has been dredged in order to maintain its depth. Green Lake lacks both surface water inflows and outflows. It once drained into Lake Washington via Ravenna Creek, but in 1911 the water level was lowered by 7 feet (2.1 m) to create parkland, causing the creek to dry up between Green Lake and Cowen Park. Ravenna Boulevard and its wide, grassy median were constructed over the creek bed. The lake is now fed by rainfall, storm runoff, and Seattle's municipal water supply.

Seattle (pronounced /siːˈætɫ̩/ ( listen) see-AT-əl or /siːˈæɾɫ̩/) is the county seat of King County, in the U.S. state of Washington. With 608,660 residents as of the 2010 Census, Seattle is the largest city in the Northwestern United States. The Seattle metropolitan area of about 3.4 million inhabitants is the 15th largest metropolitan area in the country. The city is a major coastal seaport situated on a narrow isthmus between Puget Sound (an arm of the Pacific Ocean) and Lake Washington, about 114 miles (183 km) south of the Canada–United States border. In 2010, Seattle was the sixth busiest port in the United States, serving as a major gateway for trade with Asia.

The Seattle area had been inhabited by Native Americans for at least 4,000 years before the first permanent white settlers.Arthur A. Denny and his group of travelers, subsequently known as the Denny Party, arrived at Alki Point on November 13, 1851. The settlement was moved to its current site and renamed "Seattle" in 1853, after Chief Seattle of the local Duwamish and Suquamish tribes.

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