Quảng Ninh is a mountainous and coastal province, with more than 80 per cent of its area being made up of mountains and hills. The 2,000 some islands are also considered mountains. The mountainous zone can be divided into two parts: the eastern mountainous region extending from Tiên Yên through Bình Liêu, Hải Hà, Đầm Hà and Móng Cái; and the western zone ranging from Tiên Yên through Ba Chẽ and Hoành Bồ, north of Uông Bí Town. The former is a continuation of the Thâp Van Đai Son range in China. There are two main chains: Quảng Nam Châu 1,507 m and Cao Xiêm 1,330 m. The western zone features smooth and curved mountains called Đông Triều with Yên Tu Mount 1,068 m in Uông Bí region and Am Váp Mount 1,094 m in Hoành Bồ District.