Point bars form on the inside of meander bends in meandering rivers. As the river was meandering, the canyons it carved also meander. After a short turn northwards, the river continues to meander south-easterly. Mostly unnavigable, many originate as swift highland streams, meander in valleys, and form coastal deltas. These lakes include plunge pool lakes, fluviatile dams and meander lakes. Over the centuries the gulf silted up with alluvium carried by the Meander River. The lake has a large network of canals that meander through the region of Kuttanad. The meander arc length is the distance along the thalweg over one meander. It is situated on a low limestone ridge in a meander of the River Stour. There they broaden and become sluggish as they meander westward. For a river to meander, secondary flow must dominate. Guerneville is built on an abandoned meander of the river. Streams might dry up, meander or change course. A lake that occupies a cutoff meander is known as an "oxbow lake". These fish meander along lakebeds, seeking and cracking open snails and other shelled creatures.