current, stream - a steady flow (usually from natural causes); "the raft floated downstream on the current"; "he felt a stream of air"

Charybdis - (Greek mythology) a ship-devouring whirlpool lying on the other side of a narrow strait from Scylla

course, flow, run, feed - move along, of liquids; "Water flowed into the cave"; "the Missouri feeds into the Mississippi"