Precipitation - Rain, Hail, Sleet or Snow, Source - The start of a river, mouth - where the river meets the sea or a lake, tributary - a smaller river that joins the main river, discharge - The volume of water the river carries, Confluence - The point where a tributary meets the main river, Flood Plain - Flat land liable to flooding in the lower course, Watershed - An imaginary line separating one drainage basin from another, Drainage Basin - The land around the river from which water drains into, meander - a large bend in the river in the lower course,

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