What Are U Shaped Valleys? A U-shaped valley is a geomorphological formation with steep, high sides and a rounded or flat valley bottom. They are the result of glaciation and are frequently filled with lakes, rivers, sand traps on golf courses, kettle lakes (water hazards), and other such natural features. https://wwwsofasandcouchescom15577.howeweb.com/30441269/the-complete-guide-to-sectional-u-shape