PARTS OF A RIVER By:C.Garcia Floodplain A floodplain from the Mississippi river. WATERSHED This is a watershed from Marin Municipal. SOURCE This is a source from France. HEADWATERS This is a head water from the Mississippi River. MOUTH/DELTA This Delta is from California DOWNRIVER Downriver in Shoshane Falls Tributary This is a tributary from the Amazon. Divide Drainage Basins: Definition & Characteristics Video - Lesson and Example | Education Portal Taught by If you follow a small stream downhill, where do you think it will lead? In most cases, a small stream will lead to a bigger stream, which will then lead to a river, and finally an open body of water. All of these waterways are connected and rely on precipitation to flow properly. HERE IS A VIDEO ON DIVIDE ENJOY.