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Upland and lowland are portions of a plain that are conditionally categorized by their elevation above the sea level. Lowlands are usually no higher than 200 m (660 ft), while uplands are somewhere around 200 m (660 ft) to 500 m (1,600 ft). On unusual occasions, certain lowlands such as the Caspian Depression lie below sea level. [1]
A valley is an elongated low area often running between hills or mountains and typically containing a river or stream running from one end to the other. Most valleys are formed by erosion of the land surface by rivers or streams over a very long period. Some valleys are formed through erosion by glacial ice. These glaciers may remain present in ...
Plain of Campidano, Italy. A plain or flatland is a flat expanse of land with a layer of grass that generally does not change much in elevation, and is primarily treeless.. Plains occur as lowlands along valleys or at the base of mountains, as coastal plains, and as plateaus or uplands.
Col – Lowest point on a mountain ridge between two peaks; Cuesta – Hill or ridge with a gentle slope on one side and a steep slope on the other; Dale – Low area between hills, often with a river running through it; Defile – Narrow pass or gorge between mountains or hills; Dell – Small secluded hollow
A rift valley is a linear shaped lowland between several highlands or mountain ranges produced by the action of a geologic rift. Rifts are formed as a result of the pulling apart of the lithosphere due to extensional tectonics. The linear depression may subsequently be further deepened by the forces of erosion.
Hügelland (German: [ˈhyːɡl̩ˌlant] ⓘ) is a type of landscape consisting of low rolling hills whose topography or surface structure lies between that of a lowland region (plains or river terraces) and that of a more rugged hill range or low mountain range.
Rocky Mountain foothills near Denver, Colorado. Foothills or piedmont are geographically defined as gradual increases in elevation at the base of a mountain range, higher hill range or an upland area. They are a transition zone between plains and low relief hills and the adjacent topographically higher mountains, hills, and uplands. [1]
Hills in the Puget Lowland, between the Cascades and the Olympic Mountains, including the entire Seattle metropolitan area, are generally between 350–450 feet (110–140 m) and rarely more than 500 feet (150 m) above sea level. Hills are often notable geologically and for social reasons, such as the seven hills of Seattle.