Trithemis aurora
The Crimson Marsh Glider (Trithemis aurora) is a medium sized dragonfly that is commonly found in weedy tanks and ponds, marshes, channels, and slow flowing streams and rivers in the lowlands and mid-hills. It breeds in streams, rivers, canals, ponds and tanks. It is found commonly and widely distributed in East Asia throughout the year.
The male of the species (see pic above) is distinctly different from the female (see below).
H/t Project Noah
~Eowyn