1. The Central Highlands is also highly appreciated thanks to its high biological ……….. 2. The Bach Ma area has long been famous for its rich ……., and plant species richness within Bach Ma national park is still high. 3. Son Doong Cave has been ……….. as the largest natural cave in the world. 4. Phong Nha Cave has the longest underground river, the highest and longest cave, broadest and most beautiful fine sand beaches inside the caves, the most spectacular stalagmites and ………… 5. Ecotourism is a form of travel that seeks to improve environmental ……….. foster cultural respect, and benefit the economic development of local communities. 6. The Mekong delta is one of the world’s largest and most …………. inland fisheries. 7. The most typical ……... activities are visits and studies in some national parks, adventurous activities in the mountain areas, and community-based ecotourism activities in the mountainous areas. 8. Researchers consider Phong Nha – Ke Bang to be particular importance for bird ……….
