Walk where I tap in Android

So I wanna make a game where the camera is above you locked in position and you can only move in the camera zone, so how do I make it so wherever you tap you run to?

In order to do that, your character needs to have a NavMeshAgent attached, and you need to define a NavMesh (check online tutorials on how to do that). Then, as pointed out by @ahaykal, you need to raycast using the touch screen position, get the intersection with the NavMesh object, and finally tell your NavMeshAgent to move there.