colordo
Normally flowing water, such as rivers will slowly cut through land to form valleys cliffs and trenches.
what do people build to cross deep rivers or valleys?
A bridge.
A bridge
mountains and water falls plateau deep river valleys vaconos
A bridge.
Rivers' surface located in deep valleys can be below of the ocean surface. Furthermore, there are underground rivers which certainly are below sea level, depending on how deep such rivers are placed below-ground.
North Korea has rivers, active volcanoes, lakes, mountains, deep valleys and caves also.
The Catskill Mountains are part of the Appalachian Mountain range in the eastern United States. The landscape in the Catskills is characterized by forested mountains, deep valleys, and winding rivers, making it a popular destination for outdoor recreation such as hiking, fishing, and skiing.
Those deep valleys are mainly in Wales, in the southwest of Britain.
rift valleys
a glen