Islands Marías and Teacapan Estuary, Mexico21.6N 106.5W
Visible on the left side of this image are the Islas Marías, an archipelago of four islands that belong to Mexico. They are located in the Pacific Ocean, some 100 km (62 mi) off the coast of the state of Nayarit. They are part of the municipality (municipio) of San Blas, Nayarit. In 2010 the archipelago was designated Biosphere reserve by the UNESCO.
Visible on the mainland opposite the islands (the green area along the coast to the northeast of the archipelago) is the Teacapan Estuary. This long outlet drains two large coastal lagoons, Agua Grande Lagoon in Sinaloa on its northern end and Agua Brava Lagoon in Nayarit at its southern end, into the Pacific Ocean at its mouth, the Boca Teacapan. The estuary forms part of the border between the Escuinapa Municipality, Sinaloa, and the Tecuala Municipality of Nayarit. The Teacapan Estuary is also fed by the Acaponeta River in its southern arm, and the Cañas River in the northern arm