The state of Maine is a state in the New England region of the northeastern United States, bordered by the Atlantic Ocean to the southeast, New Hampshire to the southwest, and the Canadian provinces of Quebec to the northwest and New Brunswick to the northeast. Maine is the northernmost portion of New England and is the easternmost state in the contiguous United States. It is known for its scenery—its jagged, mostly rocky coastline, its low, rolling mountains, and its heavily forested interior—as well as for its seafood cuisine, especially lobsters and clams.

The original inhabitants of the territory that is now Maine were Algonquian-speaking peoples. The first European settlement in Maine was in 1604 by a French party. The first English settlement in Maine, the short-lived Popham Colony, was established by the Plymouth Company in 1607. A number of English settlements were established along the coast of Maine in the 1620s, although the rugged climate, deprivations, and conflict with the local peoples wiped out many of them over the years. As Maine entered the 18th century, only a half dozen European settlements still survived. Patriot and British forces contended for Maine's territory during the American Revolution and the War of 1812. Maine was an exclave of Massachusetts until 1820, when as a result of the growing population and a political agreement regarding slavery, it became the 23rd state on March 15 under the Missouri Compromise.

Maine is the only U.S. state to have a name that is one syllable long, and the only state which borders exactly one other state.

There is no definitive answer for the origin of the name Maine. The state legislature in 2001 adopted a resolution establishing Franco-American Day, which stated that the state was named after the ancient French province of Maine.[5] Other theories mention earlier places with similar names, or claim it is a nautical reference to the mainland.[6] The first known record of the name appears in an Aug. 10, 1622 land charter to Sir Ferdinando Gorges and Captain John Mason, English Royal Navy veterans, who were granted a large tract in present-day Maine that Mason and Gorges "intend to name The Province of Maine." Mason had served in Royal Navy in the Orkney Islands where the chief island was called Mainland, a more likely name derivation for these English sailors than the French province.[7] Whatever the origin, the name was fixed in 1665 when the King's Commissioners ordered that the "Province of Maine" be entered from then on in official records.
To the south and east is the Atlantic Ocean and to the north and northeast is New Brunswick, a province of Canada. The Canadian province of Quebec is to the northwest. Maine is both the northernmost state in New England and the largest, accounting for nearly half the region's entire land area. Maine also has the distinction of being the only state to border just one other state (New Hampshire to the west). Maine is the easternmost state in the United States both in terms of its extreme points and its geographic center. The municipalities of Eastport and Lubec are, respectively, the easternmost city and town in the United States. Estcourt Station is Maine's northernmost point, as well as the northernmost point in New England. (For more information see extreme points of the United States).