New York–New Jersey Highlands New York–New Jersey Highlands The New York – New Jersey Highlands is a geological formation composed primarily of Precambrian igneous and metamorphic rock running from the Delaware River near Musconetcong Mountain, northeast through the Skylands Region of New Jersey along the Bearfort Ridge and the Ramapo Mountains, Sterling Forest, Harriman and Bear Mountain State Parks in New York, to the Hudson River at Storm King Mountain. The northern region is also known as the Hudson Highlands and the southern as the New Jersey Highlands. A broader definition would extend the region west to Reading, Pennsylvania, and east to the Housatonic
New Jersey v. New York channel. This agreement was fashioned in order to allow New Jersey to build docks on the riverfront, while allowing New York to control islands that it already considered integral parts of its territory. This led to places such as Ellis Island located on the New Jersey side of the river, but belonging to New York. Between the 1890s and 1934, Ellis Island was expanded through land reclamation and soon became a major center for immigrants coming from Europe to the New World. This land was added by the federal government and considered part of New York for decades before New