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Drainage Basin. Drainage Basin – all the area of land drained by one river and its tributaries. Watershed or water divide. The edge of a drainage basin. The high ground that divides one drainage basin from another. Watershed. Watershed. Source - The point where a river starts.

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Watershed or water divide. The edge of a drainage basin.

The high ground that divides one drainage basin from another.

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Source -

The point where a river starts.

The Mississippi with its source Lake Itasca at 450 m. above sea level in northern Minnesota.

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Tributary – the Missouri joins the Mississippi. A small river that flows into a bigger river is a tributary.

The Mississippi is joined by the Illinois River and the Missouri River at Saint Louis, and by the Ohio at Cairo, Illinois. The Arkansas River joins the Mississippi in the state of Arkansas.

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Confluence –

Where two rivers join.

The Missouri flows into the Mississippi. ‘The Big Muddy’ and ‘The Mighty Mississippi’. First explored 1804 by Lewis and Clark.

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Mouth – the end of a river.

The Mississippi has built a delta at its mouth.

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The Mississippi flows into the Gulf of Mexico. Hurricanes occur here! The delta can be swamped by the sea.

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