The Rio Grande de Santiago is one of the longest rivers in Mexico, flowing through the western part of the country. It originates in the Sierra Madre Occidental mountains and travels approximately 700 kilometers before emptying into the Pacific Ocean. The river is vital for irrigation and supports agriculture in the surrounding regions. The river passes through several important cities, including Guadalajara and Tepatitlán, and is known for its diverse ecosystems. It also plays a significant role in local culture and history, providing water for communities and serving as a natural resource for fishing and recreation.