Enclaves and Exclaves by FlaxmanR

Question 4

A recent agreement between two countries will finally end the existence of the world’s only third-order enclave – a piece of country A, surrounded by land belonging to country B, surrounded again by land belonging to country A, and the whole thing finally being surrounded by the mainland of country B. (Whew!) This small piece of land, named Dahala Khagrabari, is part of the soon-to-be-simplified border between what TWO nations?

India and Bangladesh