The point of origin of a stream is called the headwaters or source. The entire basin drained by the stream is termed the watershed. Every watershed is made up of smaller watersheds, while most watersheds are parts of larger watersheds. For instance, the Continental Divide in North America divides the Atlantic Ocean watershed from the Pacific Ocean watershed, but the Atlantic Ocean watershed may be first divided into the Atlantic Ocean drainage and the Gulf of Mexico drainage. This is termed the Eastern Divide. The Gulf of Mexico watershed may be divided into Mississippi River basin and a number of smaller watersheds, such as the Tombigbee River watershed. The Mississippi River watershed includes the Ohio River watershed, which in turn includes the Kentucky River watershed, and so forth.
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