Relier Pairs Stages of a river: features and characteristicsVersion en ligne To relate key information about the different parts of a river. par Elvira Garcia Arnal 1 Source 2 Mouth 3 Lower course 4 Middle course 5 Upper course The final stage near the coast. The start. It is often a place in the mountains. The water flows more slowly than in the upper course and there are meanders. Initial stage of the river. You can find rapids and waterfalls. The end. A delta or estuary can be there.