Cat Ba National Park is located 15km north-west of Cat Ba Town. It was (26) __________ in 1986. It spans an area of 15,200ha, of which 9,800ha are forest, and has lots of particularly interesting caves. The original tropical forest spans an area of 570ha, with extremely varied wildlife and vegetation. The park is (27) __________ in Cat Ba Island and on several smaller islands nearby. It currently (28) __________ 98km2 of total land area, 54 km2 of inshore waters. The park was Viet Nam’s first national park (29) __________ include both terrestrial and marine ecosystems. It is (30) __________ nationally and internationally for its importance in biodiversity conservation. It contains many (31) types of ecosystem and habitat. The park has a great (32) __________ of plant and animal species.
Cat Ba National Park differs (33) __________ other national parks in Viet Nam because of the variety of landscapes and ecosystems, (34) __________ tropical evergreen forests, mangrove, freshwater lake and streams, isolated sandy beaches, coral reefs, caves and grottoes. The park is a tourist (35) __________ to millions of domestic and oversea visitors.

Located in the limestone mountains of Phong Nha - Ke Bang National Park, Son Doong Cave was first found in 1991 by Ho Khanh, a local man. In 2009, the cave was explored and published by a group of scientists from British Cave Research Association.
Son Doong Cave was formed from 2 to 5 million years ago, when river flowed through the limestone mountain area and was buried. The water eroded limestone and created an underground tunnel. In soft limestone areas, the collapse of tunnel ceiling formed large holes which became giant domes afterward. The cave is about 200m high, 200m wide and least 8.5km long. Especially, Son Doong consists of two entrances, which is unique among explored caves in Phong Nha - Ke Bang National Park. Exploring the cave, visitors were surprised with spectacular scenery of numerous stalactites of which some giant stalagmites are more than 60 metres high. Deep inside the cave exists a grandiose tropical jungle called “Garden of Eden” by the explorers. The jungle is home to a diversified system of fauna and flora. Besides, the cave possesses a 2.5-kilometre underground river. Not far from the “Garden of Eden” lies an enormous “pearl collection” consisting of tens of thousands of small stone pieces in dry ponds, contributing to magnificent beauty of the cave.