affluent, arm, armlet, bay, belt, bight, billabong, boca, branch, confluent, confluent stream, cove, creek, dendritic drainage pattern, effluent, estuary, euripus, feeder, fjord, fork, frith, gulf, gut, harbor, inlet, kyle, loch, mouth, narrow, narrow seas, narrows, natural harbor, prong, reach, road, roads, roadstead, slough, sound, strait, straits, tributary