This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

Passage: Burma is bordered in the northwest by the Chittagong Division of Bangladesh and the Mizoram, Manipur, Nagaland and Arunachal Pradesh states of India. Its north and northeast border is with the Tibet Autonomous Region and Yunnan province for a Sino-Burman border total of 2,185 km (1,358 mi). It is bounded by Laos and Thailand to the southeast. Burma has 1,930 km (1,200 mi) of contiguous coastline along the Bay of Bengal and Andaman Sea to the southwest and the south, which forms one quarter of its total perimeter. Question: What countries surround the border that is opposite the southwest border of Burma?
Burma is bordered in the northwest by the Chittagong Division of Bangladesh and the Mizoram