natural bridge (3 photos)

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crossing the river on a underwater natural bridge - clearwater cave - mulu (borneo), borneo, cavers, caving, clearwater cave system, clearwater connection, clearwater river, fording, gunung mulu national park, malaysia, natural bridge, natural cave, river cave, river crossing, roland, spelunkers, spelunking, underground river, underwater bridge, wading
crossing the river on a underwater natural bridge, clearwater cave, mulu, borneo
natural arch - natural bridge - black sea (bulgaria), black sea, natural arch, natural bridge, susi, tyulenovo
natural arch, natural bridge, black sea, bulgaria
natural bridge - thailand, caving, natural arch, natural bridge, natural cave, spelunking, thailand, wat
natural bridge, thailand