Foz do Iguaçu is the Brazilian gateway to the spectacular Iguazu Falls, sharing borders with Argentina and Paraguay. Because the local economy relies heavily on international tourism, it is one of the safest cities in Brazil. The National Park and the area surrounding the tourist hotels are exceptionally secure. The primary risks for tourists are not criminal, but environmental. The subtropical climate brings extreme heat and humidity, requiring constant hydration. Tourists must also be careful of the local wildlife in the park, particularly the Coatis (small, raccoon-like animals); do not feed or touch them, as they can become aggressive and carry rabies. Mosquito repellent is highly recommended to prevent Dengue fever.