Ha Long Bay is located in the Quang Ninh province in northern Vietnam, about 100 miles east of Hanoi. Designated as a UNESCO World Heritage Site, Ha Long Bay stretches approximately 168 square miles. There are more than 1,600 islands and islets rising from the bay that are surrounded by stunning turquoise and emerald green waters. Most are untouched and uninhabited. Book a full-day cruise from Hanoi with Halong Hanoi Transfer, which includes lunch and kayaking. And for optimal weather conditions, plan to visit in spring or fall when it's cooler.

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