Source - The beginning of a river , Spring - Water that comes out of the ground at the top of a mountain , Stream - A small river, River - A large natural flow of water , Floodplain - Area of flat land either side of the river likely to flood , Tributary - A stream or river that joins another river , Confluence - The point where a tributary joins a river , Meander - A bend in a river , Oxbow Lake - A lake created when a meander is cut off , Mouth  - Place where the river meets the sea , Drainage basin - The area of land drained by a river, Watershed - The edge of highland surrounding a drainage basin, Waterfall - Where a band of hard rock lies over a softer one, creating an overhang via erosion., Delta - Where a river carrying a large amount of sediment meets  lake or the sea,

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