The Outer Lands is the prominent terminal moraine archipelagic region off the southern coast of New England in the United States. This eight-county region of Massachusetts, Rhode Island, and New York, comprises the peninsula of Cape Cod and the islands of Martha's Vineyard, the Elizabeth Islands, Nantucket, Block Island, and Long Island, as well as surrounding islands and islets.
Though the existence of an arc or chain of islands in this archipelago is widely acknowledged by geographers, it is rarely given a specific name; occasionally a descriptive term such as southern New England islands or a technical term such as Cape Cod/Long Island ecoregion or Long Island-Cape Cod Coastal Lowland is used. The Isles of Stirling was the name granted in 1635 when the islands came into the possession of William Alexander, 1st Earl of Stirling. "Outer Lands" is a term popularized by author Dorothy Sterling in her 1967 natural history guide of the same name, and used by later natural history authors such as Patrick J. Lynch.
The Massachusetts section is often called the "Cape and Islands", with the "Islands" subregion very specifically referring to Martha's Vineyard and Nantucket, and other smaller islands in Dukes and Nantucket counties.
Long Island is often informally considered a part of the "New York islands", together with Staten Island and Manhattan. These islands are geographically contiguous with the broader region. (The insular Massachusetts sections were actually part of the Province of New York for most of the late 17th century.)
Rarely, Sandy Hook in New Jersey is included.
The Outer Lands forms the insular northeasternmost extension of North America's Atlantic coastal plain. The islands of the Outer Lands were formed of terminal moraines deposited on a series of cuestas by the recession of the Laurentide Ice Sheet during the Wisconsin glaciation.
For eastern Long Island and areas east, the region is designated Environmental Protection Agency ecoregion 84 for the Atlantic coastal pine barrens, with the majority 84a for "Cape Cod/Long Island", and along the Long Island south shore 84c for "Barrier Islands/Coastal Marshes". Western Long Island and along the north shore is largely 59g for "Long Island Sound Coastal Lowland", a part of the broader Northeastern Coastal Zone.
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