A caver stands in a sunbeam coming through an entrance to Hang En Cave in Phong Nha Ke Bang National Park, Vietnam. This natural phenomenon occurs only in the months of December and January.

adventure beauty in nature cave day entrance exploration explorer full length getting away from it all hang en hiking horizontal indoors national park one man only one person phong nha ke bang physical geography quang binh rock rock formation solitude spotlight standing sunbeam vacations vietnam