Caguas Basin

geographical feature, Puerto Rico

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June 22, 2026

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The Caguas Basin is a significant geographical feature in east-central Puerto Rico. It is the largest interior valley on the island and is situated in the valley of the Grande de Loíza River, south of San Juan. This basin, along with other mountain valleys, provides level land suitable for settlements and agriculture. The town of Caguas itself lies within this fertile valley. The basin is part of the broader mountainous terrain of Puerto Rico, which is the easternmost extension of a ridge stretching across the northern Caribbean. The Caguas Basin is separated from the Sierra de Cayey by other valleys.123

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Puerto Rico
Relief
The Caguas Basin, in the Grande de Loíza River valley south of San Juan, is the largest of several basins in the mountains that provide level land for settlements and agriculture. The islands of Mona, Vieques, and Culebra are generally hilly but ringed by narrow coastal…
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The Caguas Basin, in the Grande de Loíza River valley south of San Juan, is the largest of several basins in the mountains that provide level land for settlements and agriculture. The islands of Mona, Vieques, and Culebra are generally hilly but ringed by narrow coastal…
Read More