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Map of the district of Katha in northern Burma (Myanmar) featuring the Irrawaddy River, and the Mu Valley State Railway (still partially under construction). High points are marked with their heights so they can be used for triangulation.

Map of the district of Ruby Mines in northern Burma (Myanmar) featuring the Irrawaddy and Shweli rivers. High points are marked with their heights so they can be used for triangulation. As the name suggests, the district was known for its rubies.