Valleys may arise through several different processes. Most commonly, they arise from erosion over long … See more

There are many terms used for different sorts of valleys. They include:
• Cove: A small valley, closed at one or both ends, in the central or southern Appalachian Mountains which sometimes results from the erosio… See more

Some of the first human complex societies originated in river valleys, such as that of the Nile, Tigris-Euphrates, Indus, Ganges, Yangtze, Yellow River, Mississippi, and arguably the Amazon. In prehistory, the rivers were … See more

• Albertine Rift
• East African Rift
• Ethiopian Rift Valley
• Great Rift Valley
• Nile Valley (Egypt/Sudan/Ethiopia/Uganda)… See more

Numerous elongate depressions have been identified on the surface of Mars, Venus, the Moon, and other planets and their satellites and are known as valles (singular: 'vallis'). Deeper valleys with steeper sides (akin to canyons) o… See more

• Geography portal
• Canyon – Deep chasm between cliffs
• Grass valley – Meadow within a forested and relatively small drainage basin
• Gully – Landform created by running water and/or mass move… See more