Guiana Amazonian Park (French: Parc amazonien de Guyane) is a national park in French Guiana and France's largest park. With an area of 33,900 km<sup>2</sup>, the takes up most of the land area of French Guiana, with that number being a good 41% of the French department. As French Guiana is an overseas department of France, it means that the European Union's largest national park isn't in France, but instead in South America!
While a national park, there are still many communes within the park, and within the communes are several smaller settlements. Contrary to the typical settlement in a national park (e.g. Yosemite Village in Yosemite National Park, Thredbo in Kosciuszko National Park, Banff in Banff National Park or Milford Sound in Fiordland National Park), these are traditional villages that are isolated, and these were not established as tourist towns; these villages are the homes of the Indigenous peoples who live in the current boundaries of the park. The main communes of the park as follows:
While the park does have a website in both English and French, the English website may not work properly and the French website has much more detailed information. Even if you knew no French, you're much better off going to the French website and then machine translating it.
Guiana Amazonian Park is very off the beaten track; access is only via an aeroplane or a pirogue as there is no road access to the rest of French Guiana or anywhere else for that mater. Furthermore, there are few airports or landing strips, and services are very limited. All services that operate to these airports are operated by Air Guyane Express.
There are many villages within Guiana Amazonian Park that may be in the middle of nowhere. While access is limited, unless you have good reason to, make sure to ask permission before visiting. If you are visiting, never take photographs without asking permission as it's considered disrespectful to do so.
Your only option is to go out and explore the rest of French Guiana.