Located east of ninh binh province and covering almost 2000 hectares thetrang an eco tourism complex is divided into 5 sections a specially preserved area hoa lu ancient citadel a central area a natural area of grottoes and caves a tourist service area and a holy mountain of bai dinh area the total 47 historical vestiges hidden caves and grottoes in limestone karst geomorphology valleys rivers and streams all together create a fanciful landscape with hundreds of big and small statu