Trang An Grottoes is Scenic Landscape Complex in Ninhbinh province of Vietnam, It is covers an area of 6,172ha in districts of Hoa Lu, Gia Vien, Nho Quan, Tam Diep Town and Ninh Binh City, about 90km to the southeast of Hanoi. The complex is surrounded by a buffer zone of 6,268ha, mostly comprising paddy rice fields and villages. As a mixed cultural and natural property, Trangan Landscape Complex contains three protected areas, including Hoa Lu Ancient Citadel Cultural – Historical Area; TrangAn – Tam Coc – Bich Dong Scenic Area and Hoa Lu Special-Use Primary Forest.
Located in the humid tropical region, the Landscape Complex is a mountainous area that extends in a northwest-southeast direction. To the north and northwest of Trang An lie Bai Dinh karst hills; to the southwest and the south are Dong Tam – Son Ha and Tam Coc – Bich Dong karst ranges; to the southeast and northeast is Truong Yen karst range; to the northeast and the north is Trang An karst range. River network in Trang An is well developed with Hoang Long River to the north, Chanh River to the east, He River to the south, Ben Dang River to the west and river systems of Sao Khe, Ngo Dong and Den Voi in the heart of the heritage. The Grottoes was invaded and reworked by the sea many times in the recent geological past but is now emergent on land. Landform development over a period of more than five million years produced scenic landscape of extraordinary beauty – a blend of towering cliff-bounded mountains draped in natural rain forest, surrounded by huge and deeply developed internal basins whose clear and quietly flowing waters are connected through a myriad of underground streams and caverns, many of which are navigable by small sampans carrying tourists in Tourist Complex of Landscape .
Trangan Grottoes is a prominent place in Southeast Asia and the world which contains abundant archaeological evidences preserved almost intactly, mostly shells, animal bones, pottery, stone tools, kitchen floor and human remains. This is an extremely valuable documentary treasure demonstrating the way that prehistoric human interacted with natural landscape and adapted to major changes of environment over more than 30,000 years, at least since the late Ice Age. During this time, they endured some of the most turbulent climatic and geographical changes in the Earth's history. Besides, cultural and historical relics such as pagodas, temples, palaces in TrangAn Grottoes also contribute to consolidating many archaeological documents.