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Which mountain ranges border the lower Irrawaddy River valley?

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Irrawaddy River The Irrawaddy and Mekong river basins and their drainage networks.

In its lower course, between the cities of Minbu and Pyay (Prome), the Irrawaddy River flows through a narrow valley bordered by two forest-covered mountain ranges:

The Arakan (Rakhine) Mountains to the west.1
The Pegu (Bago) Mountains to the east.1

These same mountain ranges also form the sides of the river's delta as it approaches the Andaman Sea.1