Triple Frontier is the place where the Iguazu River flows into the Parana River and forms the natural border between Paraguay, Argentina, and Brazil. In the wider area of the Triple Frontier, there are about 950,000 inhabitants in all three countries, so that cultural and economic exchange is not in question. All three countries have erected an obelisk painted in national colors on their shores, which can be seen from the other two countries. Visitors can learn from local guides a lot of interesting information related to this area, such as assumptions that here are the largest freshwater reserves in the world and stuff like that.