Britannica
Sources used in this answer
Which type of rock forms the second defile of the Irrawaddy River?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
Irrawaddy River
The Irrawaddy and Mekong river basins and their drainage networks.
The second defile of the Irrawaddy River is formed by limestone rocks.1