First, investigate on Google Earth. Look for mountains, valleys, plains, plateaus, rivers, beaches, cliffs...
Google Earth
Rivers and Coasts
The Landscape II
Landscapes
Rivers and Weather
Landscape changes caused by man and by nature
To learn about rivers and coasts
Rivers and Coasts
To learn a lot of more about landscapes
The Landscape II
Landscapes
Rivers and Weather
Landscape changes caused by man and by nature