Where Is Ha Long Bay? Ha Long Bay is one of the most famous travel destinations in northern Vietnam. Located about 170 km from Hanoi, it’s an easy trip from the capital and a must-visit if you are exploring the northern part of the country. The bay is known for its dramatic landscape of limestone formations rising from emerald waters and is recognized as a UNESCO World Heritage Site. Ha Long Bay covers an area of around 1,553 square kilometres and contains nearly 2,000 limest