Tumbes is a coastal department and region in northwestern Peru bordering Ecuador. Due to the region's location near the Equator it has a warm climate, with beaches that are considered among the finest in Peru. Despite its small area, the region contains a wide variety of ecosystems. It is the smallest department in Peru and its third least populous depart…Tumbes is a coastal department and region in northwestern Peru bordering Ecuador. Due to the region's location near the Equator it has a warm climate, with beaches that are considered among the finest in Peru. Despite its small area, the region contains a wide variety of ecosystems. It is the smallest department in Peru and its third least populous department after Moquegua and Madre de Dios, but it is also its third most densely populated department, after La Libertad and Lambayeque.