of Geology and Mines, an executive (cabinet) agency of the government of Bhutan. The Department, as part of its environmental "mitigation projects," aims to lower the levels of glacial lakes and thereby avert GLOF-related disaster. One such glacial lake mitigation project, for example, aimed to lower water levels by five meters over three years. The Department uses silent explosives and other means it considers environmentally friendly in order to minimize the ecological impact of its mitigation projects. These projects, however, remain difficult to conduct because of the weather, terrain, and relative lack of oxygen at the glacial lakes' altitudes. As of September 2010, GLOF early warning systems were slated for installation by mid-2011 in Punakha and Wangdue Phodrang Districts at a cost of USD4.2 million. Lists of lakes List of non-glacial lakes Naturally occurring mountain lakes, though today fewer than glacial lakes, include several historically and spiritually relevant bodies of water. List of glacial lakes Glacial lakes in Bhutan far outnumber other kinds of lakes, and pose a particular risk to those living downstream in the event of a GLOF. Many of these lakes have appeared or grown after climate change, and the frequency at which they emit flood waters has increased. in recent history. Below is a list of the major glacial lakes in Bhutan. Many lakes appear in clusters, and may someday merge; for example, he numerous glacial lakes of Laya and Lunana Gewogs lie mostly within Jigme Dorji National Park along a handful of major glaciers. See also Geography of Bhutan Glaciers of Bhutan List of rivers of Bhutan References Lakes Bhutan