Convergent boundary
In plate tectonics, a convergent boundary (convergent fault boundary or convergent plate boundary - also: active margin) is where two tectonic plates slide towards each other and usually collide forming either a subduction zone with its associated island arc or an orogenic belt and associated mountain range.
Examples:
- the collision between the Eurasian Plate and the Indo-Australian Plate which is forming the Himalayas.
- the collision between the northern part of the Pacific Plate and the NW North American Plate whic is forming the Aleutian Islands.