Meander

rivers · geography · erosion · water

Water Takes the Scenic Route. Rivers don't flow in straight lines, they bend and curve in big loops called meanders. These wiggly paths happen because water naturally erodes the outer bank of a curve while dropping sediment on the inner bank.

Erosion and Buildup. As a river winds, it constantly carves away at the outer, curved bank and deposits sand and silt on the inner bank to form a point bar. This back-and-forth action slowly shifts the entire river channel sideways across the floodplain.

The River Moves. Over time, meanders migrate across the landscape as the river keeps eroding and depositing sediment. The river essentially walks back and forth like it's dancing across the flatland.

Creates Unique Shapes. Meanders form S-shaped and loop-shaped curves that you can see on maps and from above. Some loops get so tight that the river eventually breaks through and shortcuts, creating a curved lake called an oxbow.

A Slow Transformation. It takes many years or even centuries for meanders to form and change, but they show how powerful water is at reshaping the Earth over time.