Ha Long Bay is located in the emerald waters of the Gulf of Tonkin in the northeast of Vietnam, approximately a four-hour drive from the capital Hanoi. Including over 1600 jungle-clad islands and islets, most of which are uninhabited and unaffected by humans, Ha Long Bay forms a spectacular seascape of towering limestone pillars and wind- and wave-eroded grottoes and is an ideal model of a mature Karst landscape developed during a warm and wet tropical climate. The bay’s ethereal scenic beauty is complemented by its great biological interest, hence why it was declared a UNESCO world heritage site in 1994. You can catch a glimpse of Ha Long Bay on a day trip from Hanoi, yet if you want to get the most out of your journey, you should allow at least two days and book an overnight cruise. This will allow you to see the world-famous Bay at its most beautiful during the sunset or sunrise, or under a starry or moonlit night.