Rising from the emerald waters of northern Vietnam, Ha Long Bay is one of Southeast Asia’s most breathtaking natural wonders. This UNESCO-protected seascape is famous for its thousands of dramatic limestone islands, hidden caves, floating fishing villages, and calm jade-colored waters in the Gulf of Tonkin. For most travelers, the best way to experience Ha Long Bay is with a 2 day 1 night cruise, which allows enough time to sail through the karst formations, kayak into secluded lagoons, explore massive caverns, and enjoy sunrise and sunset on the water. In this complete Ha Long Bay cruise review, we’ll share exactly what to expect, the pros and cons of the experience, and practical travel tips to help you decide if an overnight Ha Long Bay cruise is worth it for your Vietnam itinerary.