The Parque Nacional Lagunas de Chacahua spreads for about 20 miles of open-ocean beach shoreline and islet-studded jungly lagoons midway between Pinotepa Nacional and Puerto Escondido. Tens of thousands of birds typical of a host of Mexican species fish the waters and nest in the mangroves of the two main lagoons, Laguna Pastoría on the east side and Laguna Chacahua on the west.

The fish and wildlife of the lagoons, overfished and overhunted by local people during the 1970s and 1980s, are now recovering. Commercial fishing is now strictly licensed. Crocodiles were hunted out during the 1970s, but the government is restoring them with a hatchery on Laguna Chacahua.

For most visitors, mainly Mexican families on Sunday outings, access is by boat, except for one unpaved road (passable in the dry season; marginally so in the wet). From east-side Zapotalito village, the local fishing cooperative offers full- and half-day boat excursions to the beaches, Playa Hermosa on the east side and Playa Chacahua on the west.