Van Don is the largest, most populated and most developed island in the archipelago.Van Don is 50km from Ha Long city. Ke Bao and Van Hai are two main islands that belong to Van Don with hundreds of rock islands surrounding Bai Tu Long bay.

All of the islands are200 or 300 metres high from the sea limestone mountains with lots of amazing caves.Cai Rong is the main town on the island, which is about 30km in length and 15km across at the widest point. Bai Dai runs along much of the southern side of the island and is hard-packed sand with some mangroves. Just offshore, almost touching distance away, there are stunning rock formations similar to those in Halong Bay.Bai Tu Long Bay is highly appreciated as an interesting wonder with valuable geology and various ecosystem which surrounded by Van Don island district.