I
Elongate depression of the Earth's surface.
Valleys are commonly drained by rivers and may be in a relatively flat plain or between ranges of hills or mountains. Valleys formed by rivers and slope denudation are typically V-shaped; those formerly occupied by glaciers are characteristically U-shaped. Valley evolution is controlled mainly by climate and rock type. Very narrow, deep valleys cut in resistant rock and having steep, almost vertical sides are called canyons. Smaller valleys of similar appearance are called gorges.
II
[c mediumvioletred] (as used in expressions)
Central Valley
Cherry Valley Raid
Coachella Valley
Death Valley
Fergana Valley
Great Rift Valley
Rift Valley
Gudbrands Valley
Iao Valley
Wailuku Valley
Imperial Valley
Kings Valley of the
Kobuk Valley National Park
lily of the valley
Matapédia Valley
rift valley
San Fernando Valley
Shenandoah Valley
Silicon Valley
Squaw Valley
Ten Thousand Smokes Valley of
Tennessee Valley Authority
{{link=Valley Forge National Historical Park">Valley Forge National Historical Park