"The Son Doong cave is 262 feet wide throughout most of the passage, and features a 1.6 mile long river and 230 feet stalagmites. For a couple of miles of the passage, the cave measures 460 feet wide." More...
Telecanter already posted about this, but there's a few new pics. One of these days I'll have to do a review of all of the caves/underground labyrinths in N. America & France I've explored and post up some pics.
Hero Games - Star Hero
3 hours ago