San Blas is a fishing village and burgeoning tourist destination in the state of Nayarit. It is located about 140km north of Puerto Vallarta and 70km west of the state capital of Tepic. San Blas boasts several attractive beaches. The area's notorious population of sand-flies have kept them safe from large-scale touristic development. San Blas sits between two estuaries. These two estuaries, the Pozo and El Rey, are the main entries into a vast wetlands system. The many rivers that flow through the mangrove forests serve as the breeding grounds for fish. The wetlands also serve to buffer the land from storms and prevent erosion.

Sightseeing
The town is known among birders for its abundance of migratory birds in the surrounding estuaries and lowland palm forests, attracting significant numbers of bird-watchers. The town is also a gateway, along with the nearby village of Matanchen, to the La Tovara national park, an extensive mangrove forest and federally-protected nature preserve accessed by small boats. A boat tour can be taken up the estuary, where a freshwater spring provides the local drinking water as well as a natural swimming hole used by both locals and tourists.