Open water is swimming in a lake, a river or the sea. Train in open water.
There is no line on the bottom to follow, so swimmers lift their heads to sight every few strokes. Cold is the real danger in open water rather than distance.
1nounopen waterSwimming in a lake, a river or the sea.
“She switched to open water and never went back to a pool.”
open water is a kind of swimming.
Practised in Swimming & Diving