This park protects important habitats such as the sandy beaches, rocky beaches, estuaries, mangroves, scarps, islands, coral reefs that represent a very important environment for the reproduction of marine diversity.

   In this marine park the most widespread type of vegetation is the mangrove, in which the red mangrove (Rhizophora mangle), the black mangrove (Avicennia germinans), the tea mangrove (Pelliciera rhizophorae), the buttonwood mangrove (Conocarpus erectus) and the white mangrove (Laguncularia racemosa) occur. The alcornoque (Mora megistoperma, a very large tree with large thin buttresses, makes an irregular appearance).

   Between Piñuela Point and Uvita Point a marine abrasion platform has formed. It is connected to the mainland via a sandy bridge or tombolo, which took shape naturally through the diffraction of the waves on the rocky point. It can be visited easily at low tide. On Ballena island and the Las Tres Hermanas islets there are two species of reptiles: the green iguana (Iguana iguana), and the basilisk (Basiliscus basiliscus). Magnificent frigate birds (Fregata magnificens), white ibis (Eudocimus albus) and brown pelicans (Pelecanus occidentalis) use these islands as a roosting site.

   The coral reefs are made up of five of the 18 species recorded in the Eastern Pacific. In addition to the wealth of fish and the abundance of marine invertebrates in the park waters, it is possible to see common dolphins (Delphinus delphis), bottle nosed dolphins (Tursiops truncatus) and, occasionally, humpback whales (Megaptera novaeangliae), sometimes with their young and in groups of 2 to 3. Marine turtles lay their eggs on Ballena Beach

   The terrestrial limits indicated by a line of markers establishing the inalienable public zone, with the restricted area of the maritime terrestrial area and the border of the adjacent wetlands and mangroves. The maritime boundary is constituted by an imaginary line enclosing the belt of rocky coral reefs formed by Tómbolo of Uvita Point, Ballena Island, Tres Hermanas (three sisters) and its surroundings, originating on the mouth of Higuerón or Morete River, and ending on Piñuelas Point.