Venture into Phia Oac - Phia Den National Park, a mountainous area known for its rich biodiversity, forests, and mineral deposits. Located west of Cao Bang City, the park includes Phia Oac mountain, one of the highest peaks in the province, offering cooler temperatures and opportunities for hiking and nature exploration.

The park is part of the Non Nuoc Cao Bang Geopark and features diverse ecosystems and historical remnants from past mining activities. It's a destination for those seeking off-the-beaten-path nature experiences in Cao Bang.