A geographic feature does not have a "function" - it was not placed there to do something, it just is.
The continental divide is an area or line on different sides of which rivers will drain into different oceans.
continental drift
The AVERAGE function.
Western part of the United States
The Mississippi River divides the US into East and West parts.
The AVERAGE function.
average function
Average Function
Average function
Average Function
Average function
The firewall is the metal wall that divides the passenger compartment from the engine compartment
The 20 degree East line of longitude roughly divides the marine west coast climate region from the humid continental region of Eastern Europe.