El Yunque National Forest in Puerto Rico becomes part of the United States National Forest System as the Luquillo Forest Reserve.

El Yunque National Forest, formerly known as the Caribbean National Forest, is a forest located in northeastern Puerto Rico. It is the only tropical rainforest in the United States National Forest System and the United States Forest Service. El Yunque National Rainforest is located on the slopes of the Sierra de Luquillo mountains, encompassing 28,000 acres of land, making it the largest block of public land in Puerto Rico.