Eddies

The swirling motion of eddies in the ocean cause nutrients that are normally found in colder, deeper waters to come to the surface.

East, West and squally South-west, with a roar, / swoop down on Ocean, and the surf and sand / mix in dark eddies, and the watery floor / heave from its depths, and roll huge billows to the shore. / Then come the creak of cables and the cries / of seamen.

She had to pass between these boiling eddies to reach the witches' domain, and for a long way the only path led over warm bubbling mud.

The rapids are fast and continuous, with very few eddies or calm spots.

Water eddies around the rocks near the shore.