Sign for Hang Sung Sot cave. To enter the cave tourists have to walk up a steep stair

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Sign for Hang Sung Sot cave. To enter the cave tourists a have to walk up a steep stair which could prove medically dangerous, apparently

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Size: 3500px × 2800px
Location: Halong Bay,Vietnam
Photo credit: © Brian Maudsley / Alamy / Afripics
License: Royalty Free
Model Released: No

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