What are the three Sierra Madre mountain names?

Answer 1

There are more than three, but the most notorious include:

• Sierra Madre Occidental, conforming most of western Mexico and its Pacific Coast
• Sierra Madre Oriental, on eastern Mexico from the US-Mexico border down to the Sierra Madre del Sur.
• Sierra Madre del Sur, crossing west-east from southwestern Mexico down to the Mexico-Guatemala border.

Answer 2

Sierra Madre Occidental, Sierra Madre Oriental, and Sierra Madre Del Sur