Ha Long Bay is a UNESCO-listed seascape of limestone islands and caves in northern Vietnam, most often seen on an overnight boat cruise. Ha Long City has many hotels, often at low rates, for a night before or after a cruise, and Cat Ba Island is a quieter, budget-friendly alternative on the edge of Lan Ha Bay.
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Overnight cruises on traditional-style boats sail from Tuan Chau and the Ha Long harbours, with transfers from Hanoi usually included or easy to arrange.
The main tourist strip on the western side of the city, with many hotels, restaurants and a beach.
Connected to the mainland by road, beside one of the main cruise departure points.
The older, more local side of the city across the bridge, with cheaper hotels.
An island town near Lan Ha Bay with budget hotels, hiking and boat trips — quieter than Ha Long.
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Spring (about March–May) and autumn (about September–November) usually bring the best weather. Summer is hot and can bring storms that cancel sailings; winter is cool and misty but cheaper.
Bai Chay and Hon Gai in Ha Long City have many budget hotels, and Cat Ba Island has cheap guesthouses too.
An overnight cruise is the classic way to see the bay; a hotel night in Ha Long before or after can make the trip from Hanoi less rushed.
Shuttle buses and private transfers run along the expressway and take a few hours; many cruises include a transfer from Hanoi.