evidence: French Polynesia is the only of the overseas collectivity that has a larger population than France’s overseas region, (it’s slightly larger than Mayotte). [...] French Guiana is the only part of overseas France that is not an island. The region borders Brazil and Suriname, which makes for a great trick trivia question when asked: "What countries border France?" Since French Guiana is actually considered a part of France, Brazil and Suriname really do border France! Despite being the only part of overseas France located on a continent, it’s not well populated. French Guiana has a population of a quarter million people and a density of only two people per square kilometer, making it one of the least densely populated places on Earth. Only Mongolia and Greenland have lower population densities. Its low population is primarily due to the fact that most of the land is a thick, impenetrable rainforest.