Where is the volcanic arc located?

The Aleutian Islands off the coast of Alaska and the Lesser Antilles south of Puerto Rico.

Explanation:

A volcanic arc is a chain of volcanoes, hundreds to thousands of miles long, that forms above a subduction zone. An island volcanic arc forms in an ocean basin via ocean-ocean subduction. The Aleutian Islands off the coast of Alaska and the Lesser Antilles south of Puerto Rico ...