Marino Ballena National Park or Ballena Marine National Park, is a National Park of Costa Rica, part of the Osa Conservation Area created as a safe area for humpback whale migration, hence its name, as Ballena is the Spanish word for whale.

From December to April, the park is visited by migrating humpback whales who come to breed in the warmer tropical waters off the Central American coast. From June to November, the whales migrate north to the West Coast of the United States and southern British Columbia, where they feed.

- Wikipedia