The Cao Bang UNESCO Global Geopark in a mountainous area in the northeast of the country. Geologically Cao Bang Geopark can be divided into two distinct parts by the so-called Cao Bang-Tien Yen deep-seated active fault. The eastern part of the area is composed of Palaeozoic limestones. The western part features sedimentary rocks, pillow basalts, ultra-mafic and granitic intrusions rich in minerals and hydrothermal alterations. The majority of its population belongs to one of nine different ethnic groups with distinct, rich cultural identities and traditions.