Another major aspect of the Caribbean Costa Rica richness is the Nature. N of Puerto Limón lies the most sophisticated natural and artificial canal network leading N to Nicaragua frontier, similar in a smaller extent to Amazon. They are inserted in Tortuguero and Barra del Colorado NPs.

From Puerto Limón and neighboring Moín and Matina to the N, you can hire a boat or take a tour to Tortuguero Canals as far as Barra del Colorado (airport). The estuaries of Matina, Pacuare, Parismina, Tortuguero and Colorado rivers are meccas for sport fishing and rafting (on Pacuare and Reventazón) lovers. Nearby beaches are just pristine.

Tortuguero NP is mainly deemed to protect the green turtles (Chelonia Mydas) and their several thousand year old egg laying from July to October. Other turtles such as the leatherback (baula) and the hawksbill (carey) also come ashore here. It is home to 7 species of tortoise, manatees, caimans and crocodiles.

Barra del Colorado National Wildlife Sanctuary covers an area of 80,000 ha rich in channels, rivers, lagoons, fluvial islands, swamp and small volcanic hills. It is also the habitat to Gaspar fossil fish together with tapir, jaguar, puma, howler and white-faced monkey, ocelot and three-toed sloth.