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the main course of a river
the Nile delta
河川系.
a river
the banks of a river
川のふち
the main current of a river
to cross a river―(泳いでなら)―swim across a river―swim over a river―(徒渉してなら)―wade across a river―ford a river―(渡し舟でなら)―ferry a river―cross a ferry