Quang Ninh is a mountainous and coastal province, with more than 80% of its area being made up of mountains and hills.
The sea and island zone of Quang Ninh has a unique terrain. There are more than 2,000 islands, making up two thirds of the Vietnam's islands. They extend along the coast for more than 250km and divide into numerous layers. The largest islands are Cai Bau and Ban Sen, while the smallest are just like rocks in a garden. The sea bottom terrain of Quang Ninh isn't smooth, and 20m-average depth. There are the remnants of ancient streams and underwater rocky banks. The streams from the mainland connect to deep drains along the sea-floor; creating a series of waterways, canals and harbors along the coast.
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