actun tunichil muknal洞窟を流れる小川 http://travel.mongabay.com/belize/600/belize_8386.JPGactun tunichil muknal洞窟を流れる小川 actun tunichil muknal洞窟を流れる小川 p20603p Creek flowing out of Actun Tunichil Muknal cave | p20603p