Lang Son is a province located in the northeastern part of Vietnam. It shares a border with China and is known for its stunning landscapes, including mountains and valleys. The region is rich in cultural heritage, with various ethnic groups, such as the Tay and Nung, contributing to its diverse traditions and festivals. The capital city of Lang Son is also named Lang Son, which serves as a key trade hub due to its proximity to the Vietnam-China border. The city features historical sites, such as the Tam Thanh Cave and Nhi Thanh Cave, attracting both tourists and researchers interested in the area's history and natural beauty.