The beginning of a river is known as its source or headwaters. Rivers often originate as underground springs that surface or as marshes that take in melted snow. A river's headwaters can also consist of many smaller stre... More »

The Arkansas River begins in Lake County, Colo., near the city of Leadville. The headwaters develop from the snowpack in the Collegiate Range of the Rocky Mountains. More »

The point where a river begins is referred to as its "headwaters," which is usually the smallest part of the entire river. Headwaters can start out in marshy areas or where there are natural underground springs. The begi... More »

At the beginning of the Triassic Period, all of the major landmasses of the Earth were still joined in a single supercontinent now known as Pangaea. This landmass began to break up through the middle period of the Triass... More » Science Earth Science Landforms

A river basin is the land water must cross to reach a river. A river basin collects all available water from various tributaries, creeks and streams in its area. More »

River cliffs are also known as cut banks or river-cut cliffs. A river cliff is formed on the outer edge of a stream bend when a fast-flowing water source erodes the surface. River cliffs are constantly undergoing erosion... More »

The Mississippi River ranges in depth from 3 feet at its headwaters to 200 feet near New Orleans. The river is dredged to a minimum depth of 9 feet. More »