What role does the Balsas River play in the Sierra Madre del Sur?

The Balsas River plays a significant role in the geography and infrastructure of the Sierra Madre del Sur:

• Structural Boundary: The river creates a structural depression to the north that helps outline the core of the Sierra Madre del Sur.1
• Geographic Breach: The river physically cuts through the mountain range, serving as a breach in the western section of the Southern Highlands.2
• Energy and Resource Management: As the river crosses the Sierra Madre del Sur, it is dammed to serve as a major source of hydroelectric power.3

Beyond its role in the mountains, the river is a vital waterway in south-central Mexico, supporting irrigation for crops such as corn, cotton, and tropical fruits within its basin.4