русло angolul

channel [channels]▼(physical confine of a river or slough)
noun
[UK: ˈtʃæn.l̩] [US: ˈtʃæn.l̩]

riverbed▼(a river bottom)
noun
[UK: ˈrɪ.vərˌ.bed] [US: ˈrɪ.vər.ˌbed]

watercourse [watercourses]▼(channel through which water flows)
noun
[UK: ˈwɔː.tək.ɔːs] [US: ˈwɔːr.tək.ɔːrs]