volcanic lakes ato polo and nuamuri koofai . national park kelimutu. kelimutu tri coloured volcano crater covered with

mountain landscape scenic blue nature indonesia lake sky park kelimutu scenery volcano flores crater water panorama travel tourism summer volcanic rock national destination beautiful view panoramic geology green outdoor moni attraction fai hiking reaction background touristic upwelling interest sulfur fumaroles nuwamuri outdoors koofai nobody yellow chemical koo subaqueous colors peak