Sierra de Cayey in the context of "Sierra de Luquillo"

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 Cordillera Central (English: "Central Mountain Range") is the only mountain range in the main island of Puerto Rico, consisting of three subranges: the western-central Cordillera Central, the southeastern Sierra de Cayey, and the northeastern Sierra de Luquillo. Bordered by the Northern Karst Belt to the northwest and costal plains to the north and south, the numerous ridges and foothills of the three subranges combined extend throughout the island. Concentrated in the western to central region of the island, the eponymous main subrange of Cordillera Central originates in the municipality of Mayagüez and merges with the Sierra de Cayey subrange on the town boundary between the municipalities of Barranquitas and Aibonito. At 1,338 meters (4,390 ft) on the town line between Ponce and Jayuya, Cerro de Punta is the summit of the Cordillera Central and the highest point in Puerto Rico.

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.

Cayey (Spanish pronunciation: [kaˈʝej]), officially Cayey de Muesas, is a mountain town and municipality in central Puerto Rico located on the Sierra de Cayey within the Central Mountain range, north east of Salinas and north of Guayama; south of Cidra and Caguas; east of Aibonito and west of San Lorenzo. Cayey is spread over 21 barrios plus Cayey Pueblo (the downtown area and the administrative center). It is part of the San Juan-Caguas-Guaynabo Metropolitan Statistical Area.

Cayey is notable for its surrounding mountains. The city has been actively growing since the 1990s, evidenced by its designation as a Metropolitan Area by the U.S. Census Bureau. It has experienced significant growth in commerce, and many major retailers, such as Wal-Mart have opened stores in the city. Industries in Cayey include sugar, tobacco and poultry. For tobacco there is a well-known company called Consolidated Cigar Corp. A new coliseum and hospital facilities have also been built. Coca-Cola is a major corporation that has a manufacturing facility in the town. Cayey is also host to one of the campuses of the University of Puerto Rico, the University of Puerto Rico at Cayey.