The Osa Peninsula of Costa Rica is well known for its biodiversity due to its numerous types of ecosystems. The Sierpe river is a major river that winds thought the Osa Peninsula which lends to it’s name “Sierpe” which means serpent when translated.  The Sierpe river is a tidal river and contains many animal species, including crocodiles, caimans, egrets, kingfisers, monkeys, iguanas, turtles, macaws and lizards. The tour takes three hours on a pontoon-type boat, which is designed so that you can easily walk and stand on it, which makes them perfect for wildlife photography,