Ninh Binh province is well known as an area with famous karst landscape that likes
inland HaLong Bay. An attractive and charming cave system is developed in Triasic limestones of
the Dong Giao formation, created a wonderful sites for tourism. The exciting features of karst
landforms in the Ninh Binh province are mogots. It is mogots make Ninh Binh province became
inland HaLong Bay. In the study area most wide spread karst forms are: mogots, karst slope and
peaks, karst remnant relief, karst relict relief, karst polje, karst dry valley and karst ponor and
sinkholes. Because of tropical climate, limestones in the study area undergone a strong chemical
weathering process, created many wonderful and diverse landscapes on the surface and cave
system underground. Many caves of different size and forms were developed underground of
limestone mountains at different altitudes. Caves of Yen Mo-Tam Diep area were investigated and
mapped for tourism developing. Many caves have a culture-historical significant such as: Hang
Mat, Tam Giao, Tra Tu, Ong Mich, Ma Tien, Chua Hang, Hang Doi and Hang But. A study results
is contribution to planning, exploration a tourism potential of Ninh Binh province as well as to kart
investigation in the region.
