The Wallkill Valley is a broad valley extending through southeastern

New York New York most commonly refers to: * New York City, the most populous city in the United States, located in the state of New York * New York (state), a state in the northeastern United States New York may also refer to: Film and television * '' ...

and northwestern

New Jersey New Jersey is a state in the Mid-Atlantic and Northeastern regions of the United States. It is bordered on the north and east by the state of New York; on the east, southeast, and south by the Atlantic Ocean; on the west by the Delaware ...

. It is composed of rolling hills, plains, and swamps (including the Black Dirt Region) surrounding the

Wallkill River The Wallkill River, a tributary of the Hudson, drains Lake Mohawk in Sparta, New Jersey, flowing from there generally northeasterly U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map, accessed Octo ...

. The valley is a subdivision of the larger

Hudson Valley The Hudson Valley (also known as the Hudson River Valley) comprises the valley of the Hudson River and its adjacent communities in the U.S. state of New York. The region stretches from the Capital District including Albany and Troy south to ...

, bound to the west by the

Shawangunk Ridge The Shawangunk Ridge , also known as the Shawangunk Mountains or The Gunks, is a ridge of bedrock in Ulster County, Sullivan County and Orange County in the state of New York, extending from the northernmost point of the border with New Jersey ...

Kittatinny Mountains Kittatinny Mountain (Lenape: Kitahtëne) is a long ridge traversing primarily across Sussex County in northwestern New Jersey, running in a northeast-southwest axis, a continuation across the Delaware Water Gap of Pennsylvania's Blue Mountain ...

and to the east by the

Marlboro Mountains The Marlboro Mountains, sometimes Marlborough Mountains, are a group of hogbacked mountains arranged in a ridge extending from Newburgh, New York, to just south of Kingston, New York. Considered to be part of the Ridge and Valley Appalachian ...

and

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 alon ...

. The northern Wallkill Valley is sometimes associated with the greater

Catskills The Catskill Mountains, also known as the Catskills, are a physiographic province of the larger Appalachian Mountains, located in southeastern New York. As a cultural and geographic region, the Catskills are generally defined as those areas c ...

region, although it is geographically separated from the Catskill Mountains by the Shawangunk Ridge and Rondout Valley. In a broader sense, the Wallkill Valley is part of the Ridge-and-Valley

physiographic province physiographic province is a geographic region with a characteristic geomorphology, and often specific subsurface rock type or structural elements. The continents are subdivided into various physiographic provinces, each having a specific characte ...

of the

Appalachian Mountains The Appalachian Mountains, often called the Appalachians, (french: Appalaches), are a system of mountains in eastern to northeastern North America. The Appalachians first formed roughly 480 million years ago during the Ordovician Period. They ...

, while the Catskills further to the north and west are part of the

Appalachian Plateau The Appalachian Plateau is a series of rugged dissected plateaus located on the western side of the Appalachian Mountains. The Appalachian Mountains are a mountain range that run down the Eastern United States. The Appalachian Plateau is the nort ...

See also