 Arles-sur-Tech is situated in the southernmost valley in mainland France before Spain, the Vallespir, through which the long river "Tech" flows.This small town is surrounded by the eastern Pyrenees which dominate the skyline around Arles-sur-Tech.The town sits on the only main road which passes through the valley, the D 115, making it accessible from Spain in the west and the plane of Roussillon and Perpignan in the east.