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The Nicoya Peninsula ( Spanish: Península de Nicoya) is a peninsula on the Pacific coast of Costa Rica. It is divided into two provinces: Guanacaste Province in the north, and the Puntarenas Province in the south. It is located at . It varies from 19 to 37 miles (60 km) wide and is approximately 75 miles (121 km) long, forming the largest peninsula in the country. It is known for its beaches and is a popular tourist destination.
The main transport and commercial centre in the region is Nicoya, one of the oldest settlements in Costa Rica. Ferries run between the town of Puntarenas on the mainland and the Nicoya Peninsula. There is an international airport in Liberia and small domestic airstrips in Nosara, Carrillo and Tambor.  The region was also featured in the book Blue Zones, by Dan Buettner, which focused on the longevity found among Nicoya's residents. 
Other notable settlements and places of interest in the area include (going roughly from north to south): Tamarindo, Santa Cruz, Nosara, Sámara, Naranjo, Paquera, Curu, Tambor, Montezuma, Santa Teresa, Mal Pais.
There are a number of nature reserves and wildlife refuges such as Cabo Blanco, Camaronal, Cueva Murciélago, Curú, La Ceiba, Romelia and the Diria National Park, as well as the projects on the islands of the adjacent Gulf of Nicoya.
- Stater, Adam. "Transportation to the Nicoya Peninsula".
- Buettner, Dan (21 April 2009) . "Contents". The Blue Zones: Lessons for Living Longer From the People Who've Lived the Longest (First Paperback ed.). Washington, D.C.: National Geographic. ISBN 978-1-4262-0400-5. OCLC 246886564. Retrieved 15 September 2009.
- Anne Casselman (2008-04-14). "Long-Lived Costa Ricans Offer Secrets to Reaching 100". National Geographic News. Retrieved 2011-03-04.
- Dan Buettner (2007-02-02). "Report from the 'Blue Zone': Why Do People Live Long in Costa Rica?". ABC News. Retrieved 2011-03-04.
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