The caves were carved by underground streams pushing through soft limestone over thousands of years. (wavehunters.com)
Pumping out this water has changed the courses of underground streams, so previously clean water now flows through arsenic - laden sediments, and wells that used to be pure in villages once healthy suddenly pump out death. (scientificamerican.com)
Formed thousands of years ago by melting glaciers, today Durmitor is home to verdant valleys and mystical underground streams. (prettywildworld.com)