Слово "tributary". Англо-русский словарь Мюллера

One tributary flowed off across the ground floor, but the main stream was up on the first.

Their only neighbours were the manager of a rubber estate a few miles up the river and the manager and his assistant, Dutchmen both, of a timber camp on one of the river's tributaries.

In the end, he ascended Dominion Creek to its head, crossed the divide, and came down on the tributary to the Klondike that was later to be called Hunker Creek.

They were returning across country after a long day's outing with Otter, hunting and exploring on the wide uplands where certain streams tributary to their own River had their first small beginnings; and the shades of the short winter day were closing in on them, and they had still some distance to go.