It took millions of years for water, seeping at an infinitesimal pace, to fashion the limestone pillars and mazes of the ancient Cliefden Caves.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/fears-cliefden-caves-will-be-destroyed-needles-gap-dam-near-canowindra
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/age-australia
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/dams
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-supply
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/australia
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rivers
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/freshwater-ecosystems
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/dams-irrigation