The Caguas Valley (Spanish: Valle de Caguas), or the Caguas-Juncos Valley, and popularly referred to as the Turabo Valley (Valle del Turabo), is a large valley lying between two mountain subranges of the Cordillera Central, Sierra de Cayey and Sierra de Luquillo, in the eastern region of the main island of Puerto Rico. From west to east, the valley is concentrated in the municipalities of Caguas, Gurabo, San Lorenzo, Juncos, Las Piedras, and Humacao.
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Caguas (Spanish pronunciation: [ˈkaɣwas], locally [ˈkawaʔ]) is a city and municipality in central eastern Puerto Rico. Located in the eponymous Caguas Valley between the Sierra de Cayey and Sierra de Luquillo of the Central Mountain Range, it is bordered by San Juan and Trujillo Alto to the north, Gurabo and San Lorenzo to the west, Aguas Buenas, Cidra and Cayey to the east, and Patillas to the south. With a population of 127,244 as of the 2020 census, Caguas is the fifth most populated municipality in the archipelago and island and a principal city of the San Juan metropolitan area.
Since 2009, Caguas is the only municipality in Puerto Rico recognized as a Tree City USA by the Arbor Day Foundation.
The Sierra de Luquillo (English: "Luquillo Mountains") is a steep-sided, high-precipitation, and deeply-forested subrange of the Cordillera Central mountain range in the main island of Puerto Rico. Separated from the southeastern Sierra de Cayey subrange by the Caguas Valley, it is concentrated from west to east in the municipalities of Rio Grande, Luquillo, and Naguabo in the northeastern region of the island. The summit of the mountain range is El Toro at 3,526 ft. (1,075 m), and its most recognizable peak is El Yunque at 3,461 ft. (1,054 m). As the location of El Yunque National Forest, the Sierra de Luquillo is a popular destination among domestic and foreign tourists.
Along with the eponymous main subrange of Cordillera Central and the Sierra de Cayey, the Luquillo mountain range is one of three subranges of the Cordillera Central. However, although a subrange of the Cordillera Central, the Sierra de Luquillo is occasionally considered to be different from the rest of the central mountain range, as it is separated from it by the Caguas Valley and the Rio Grande de Loíza basin.