Bai Tu Long Bay, located northeast of Ha Long Bay, is a hidden gem with similar limestone karsts, emerald waters, and fewer tourists. Part of the UNESCO-listed Ha Long Bay region, it offers a more tranquil and pristine alternative for visitors. The bay is dotted with untouched islands, secluded beaches, and fishing villages. Activities include kayaking, swimming, and exploring caves, .(https://www.evisagov.vn/offici....al/en-us/british.php