El Yunque National Forest

El Yunque National Forest (Spanish: Bosque Nacional El Yunque), most commonly known as El Yunque, is a tropical rainforest with cultural, historical, ecological, scientific, and recreational features in the Sierra de Luquillo mountain subrange in the northeast of the main island of Puerto Rico, managed by the U.S. Forest Service since 1903. Situated immediately outside the urban core of the San Juan metro area, within 40 km (25 mi) east of the Old San Juan historic quarter, Condado and Isla Verde resort areas, Hato Rey business center, and SJU airport, the forest is mostly concentrated in the municipalities of Río Grande, Luquillo, and Naguabo. In addition to being the only tropical rainforest in the U.S. National Forest System, it is the easternmost, southernmost, wettest, and most biodiverse national forest in the U.S.