Phong Nha

Phong Nha Travel Guide: Caves, National Park, and the Son Doong Expedition

Phong Nha-Kẻ Bàng National Park contains the world's largest known cave system by volume. Hang Son Doong — the largest single cave passage on earth — is 5km long, 200 metres high in its main chamber, and contains its own

Henrik Vinter