El Yunque National Forest (Spanish: Bosque Nacional El Yunque), formerly known as the Caribbean National Forest (or Bosque Nacional del Caribe), is a forest located in northeastern Puerto Rico. While there are both temperate and tropical rainforests in other states and territories, it is the only tropical rainforest in the United States National Forest System and the United States Forest Service. El Yunque National Forest is located on the slopes of the Sierra de Luquillo mountains, encompassing more than 28,000 acres (43.753 mi or 113.32 km) of land, making it the largest block of public land in Puerto Rico.
The forest is named after named Pico El Yunque, the second-highest mountain in the Sierra de Luquillo. Other peaks within the national forest are Pico del Este, Pico del Oeste, El Cacique and the highest peak, El Toro, which is the highest point in the national forest and eastern Puerto Rico rising 3,494 feet (1,065 m) above sea level.