Overview
A ravine is generally a fluvial slope landform of relatively steep (cross-sectional) sides, on the order of twenty to seventy percent in gradient. Ravines may or may not have active streams flowing along the downslope channel which originally formed them; moreover, often they are characterized by intermittent streams, since their geographic scale may not be sufficiently large to support a perennial watercourse. The difference between a canyon, gorge and ravine could be understood as follows:
a canyon is a narrow chasm with steep cliff walls formed by running water;
a gorge is a deep narrow passage with steep rocky sides formed by running water;
a ravine is a deep narrow steep-sided valley formed by running water
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