The park includes mangrove forests, lagoons and sandy beaches and covers an area of 20 km long and 1 km wide, stretching between the coastal towns of Sipacate and El Naranjo.

Transitional tree species include the Mexican palmetto (Sabal mexicana) and the guiana chestnut (Pachira aquatica).

[2] Over 90 bird species -both migratory and resident- have been reported, including a large nesting heron population (Ardeidae), cormorants (Phalacrocoracidae), pelicans (Pelecanidae), ibises (Threskiornithidae), plovers, dotterels, lapwings (Charadriidae) and gull species (Laridae).

[2][3] Bird species of special concern found in the park but which may be under threat in Guatemala, are: Pied-billed Grebe (Podilymbus podiceps), brown pelican (Pelecanus occidentalis), Great White Egret (Ardea alba), Snowy Egret (Egretta thula), Little Blue Heron Egretta caerulea Tricolored Heron (Egretta tricolor), Green Heron (Butorides virescens), Yellow-crowned Night Heron (Nyctanassa violacea), Boat-billed Heron (Cochlearius cochlearius), Roseate Spoonbill (Platalea ajaja), Wood Stork (Mycteria americana), Black-necked Stilt (Himantopus mexicanus), and Least Tern (Sterna antillarum).

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