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Once your boat entered the cave mouth, owners took off the nylon-sheet roof and slowly rowed deep inside so visitors could look straight around or up to the ceiling of the cave that bears different images of things or animals... For more info, please go to: http://www.vietnamtourism.com/e_pages/tourist/tourspot/natural/hd_phongnha.htm http://www.traveltovietnam.com/Guide/Hue/attractions/Around%20Hue/phongnha.asp http://www.vietnamopentour.com/english_pro/north/Phong%20Nha%20Cave.htm http://www.gocvietnam.com/fa_phong_nha.html http://www.limsi.fr/Recherche/CIG/ephongnha.htm
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