The Río Grande de Loíza is one of the longest rivers in Puerto Rico, stretching approximately 70 miles. It flows from the central mountains to the northern coast, where it empties into the Atlantic Ocean. The river is vital for local ecosystems and provides water for agriculture and communities along its banks. The river's watershed supports diverse wildlife and plant species, making it an important area for conservation. Additionally, the Río Grande de Loíza has historical significance, as it has been a source of water and transportation for the island's inhabitants for centuries.