Cocos Island (Spanish: Isla del Coco) is an island belonging to Costa Rica in its province of Puntarenas. It is located 500 km from the mainland and is the largest uninhabited island in the Pacific ocean with a total area of around 25 sq km.
Due to the island's steep banks, it's only possible to get to it during a diving safari. Dives can only be made from a boat.
The underwater rocks surrounding Cocos island have become a sort of "lighthouse" for large marine animals such as sharks, manta rays and tuna.
Here you can visit the so-called "cleaning stations" for hammerhead sharks, manta rays, and gray sharks. Since there are only a few such stations for hundreds of miles, the cleaner fish have plenty of "customers".
You can reach Cocos Island by firstly flying to the port of Puntarenas from the Juan Santamaría international airport in San Jose, and then by boat which will get you to the island in 36 hours. A much easier way to get there however is by booking a dive tour.
The best time go diving on the island is from May to October; although the weather conditions allow for diving all year round. In winter, the waters nearest the shore heat up to + 23-28 ˚C, and up to +28-30 ˚C in summer. The average air temperature is +25 ˚C. The rainy season usually lasts from May to November.
The main dive sites of the Cocos Island are underwater rocks and steep walls. The most popular ones are the mountain Alcyone with a height of 200 m and its peak at a depth of 25 m, and Bird Island rock which is near to the "cleaning station" and has an abundance of marine life.