dripstone cave, reed flute cave, ludi yan, guilin, guangxi, china. blue lilluminated rocks with small colorful part in cave.

asia asian beautiful blue bright cave cavern caverns caves china chinese color colorful colors colour colours dark drip dripstone flute formation formations geologic geological geology grotto guangxi guilin illuminated lighted lighting lights lilluminated limestone limstone ludi mineral minerals part reed reflections rock rocks small speleology stalactite stalactites stalagmite walls water yan zhuang