What Are U Shaped Valleys? A U-shaped valley is a geological formation with steep, high sides and a rounded or flat valley bottom. These valleys are formed by glaciation. They are often filled with lakes or rivers, sandtraps along a golf course, kettle lakes (water hazards), or other natural features. https://sofasandcouchescom81360.blog-eye.com/29942773/what-is-sectional-u-shape-and-why-is-everyone-talking-about-it