Inside Bend: On the inside bend of a river, slower moving water may form an eddy.
The area usually will be shallow and will hold and circulate debris in the eddy.
A river may develop strong dangerous eddies in high water and make a swimming escape challenging or impossible without assistance.
Outside Bend: On the outside bend of a river, the water is faster and deeper and will push the rescuer or boat into the bank. The bank can be undercut with exposed roots or strainers, forming entrapment situations.