The Lerma River is one of the longest rivers in Mexico, stretching approximately 400 kilometers. It originates in the Sierra de Toluca and flows through several states, including Mexico State and Guanajuato, before emptying into the Lake Chapala. The river plays a crucial role in the region's agriculture and water supply. The Lerma River basin is vital for irrigation and supports various ecosystems. It is also significant for local communities, providing water for drinking and farming. However, the river faces challenges such as pollution and over-extraction, impacting its health and the surrounding environment.