The river eddy is the swirling of fluid and the reverse current created when the river water flows past an obstacle. The river creates a space devoid of downstream-flowing fluid on the downstream side of the object. A river eddy is most visible behind large emergent rocks in swift-flowing rivers.
Check out this great video on carving turns in the eddy.
How to do a Carving Eddy Turn - Whitewater Kayaking
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