C hope this helps have a good night
Answer:
Ur answer is in the above attachment
There is a wall along it.
The gap between two mountains is called Saddle.
This area is located on a convergent plate boundary where oceanic crust collides with continental crust. Because the oceanic crust is more dense, it sinks into the ground and heats up. It thus becomes a volcano as it rises back to the surface. This process is known as subduction.