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The seasonal forests of the Caribbean and Central & South America look dead in the dry season but have a surprising diversity...
There are various deciduous forests to be found on caribbean islands and also places such as Santa Rosa national park in Cost Rica. However, I think the most extensive and accessible seasonal forests are in Mexico. There are some interesting national parks and other protected areas here, including Calakmul, Huatulco National Park in the central south, and Sumidero with it's spectacular canyons.