Rain and springs are the start of flow in a river. When the water from a rain or the water in a spring gets to the surface it starts flowing downhill. Eventually it encounters more water flowing downhill and a bigger flow is formed. Eventually it gets to be big enough to be called a river.

Ответ:

Прито́к — водоток, впадающий в другой водоток.

Объяснение:

Обычно отличается от последнего меньшей длиной и меньшей водностью,