Geomorphology

Myanmar uniquely is on the boundary of three tectonic plates, the India plate, the Burma-micro plate, and the Sunda plate.  This has caused the geological evolution of the country to be highly dependent on tectonic events over the course of millions of years.  While these plates have been moving for millions of years, the past 145 million years have been the most impactful on the creation of the Myanmar we see today.  During the Cretaceous Period, between 145 and 66 million years ago, the India Plate began to move north - this initial movement would lay the groundwork for future plate tectonic events.

In the Cenozoic Era, roughly 55 to 10 million years ago, a continent-to-continent collision took place between the India and Eurasia Plate.  This lead to the Himalayan Orogeny - an ongoing event that continues to this day changing the landscape in Southeast Asia. During this time frame the Burma Plate rotated clockwise to accommodate the major collision that was taking place.  See Images B, C, and D below to see what this would have looked like.

Image Source: https://upload.wikimedia.org/wikipedia/commons/thumb/d/dc/The_Geological_Evolution_of_Myanmar.png/675px-The_Geological_Evolution_of_Myanmar.png

Sources: 

https://en.wikipedia.org/wiki/Geology_of_Myanmar

http://www.gsm.org.my/products/702001-101352-PDF.pdf

http://myanmar-preview.iwmi.org/sites/default/files/Documents/regional_geology_of_myanmar.pdf