What Are U Shaped Valleys? A U-shaped valley is a geomorphological formation with high, steep sides and a flat or rounded valley bottom. They result from glaciation, and are usually home to lakes, rivers and sand traps found on golf courses kettle lakes (water hazards), and other such natural features. https://sofasandcouches84509.bloguerosa.com/29178179/10-unexpected-sectional-u-shape-tips