Research Article
Tuan HA
Abstract
Ichthyofauna in the phong Nha – Ke bang national Park is typically characterised by tectonic limestone structure with 300 caves, underground rivers and valuably rare flora and fauna in the Vietnam Red Book and World Red Book. Total length of cave system in this area is estimated about 80 km but joint team of Vietnamese and English explorers only discovered 20 km, in which 17 km in Phong Nha area and 3 km in Ke Bang area. Due to naturally special block Karst Phong Nha-Ke Bang, phenomenon of underground water flowing is widespread. In this region, some small streams flow into the Rao Thuong channel with some opening punctuated segments and into cave system as underground river and then gathered into Chay River and Trooc river and creat a lagest tributary of the Gianh River.