Costa Rica houses two significant arribada sites, Playa Ostional and Playa Nancite, on its Pacific shore. Playa Ostional at the Ostional National Wildlife Refuge has the maximum number of nesting female olive ridley turtles in the world. Santa Rosa National Park's Playa Nancite, comparatively quieter and more reserved than Playa Ostional, also allows visitors to experience the yearly arribada event. Show more