Boga Lake, also called Bogakain Lake.This lake is located in Ruma Upazila in the hill district Bandarban,Bangladesh. It is a natural sweet and deep water lake. Its height from sea level is nearly 1,246 feet (380 m). Geologists believe that it was created by collection of rain water in the crater of a dead volcano almost 2000 years ago.And the most interesting thing is that the lake is rectangular in shape.