Thousand Islands level year-round, and support at least two living trees. The Thousand Islands archipelago is located at the outlet of Lake Ontario at the head of the Saint Lawrence River. The region is bisected by the Canada–United States border and covers portions of Jefferson and St. Lawrence counties in the U.S. state of New York, in addition to parts of the United Counties of Leeds and Grenville and Frontenac County in the Canadian province of Ontario. Geologically, most of the islands are located where a branch of the Canadian Shield runs south across the river to join with the Adirondacks. The
Thousand Islands (Svalbard) Gerard Valck and Peter Schenk the Elder were the first to place a "great vague mass of islands stretching round the coast" south of Edgeøya. William Scoresby (1820) is thought to have been the first to label them with the popular name of "Thousand Islands", the name they retain to this day. Thousand Islands (Svalbard) Thousand Islands () is a group of small islands south of Edgeøya. They form part of the Svalbard archipelago. The group consists of over forty islands and islets, including Brotskjer, Kulstadholmane, Utsira, Tufsen, Kong Ludvigøyane, Bölscheøya, Hornøya, Tiholmane, Meinickeøyane, Sletteøya, Schareholmane, Skråholmen, Brækmoholmane, Tareloppa, Vindholmen,