Because water solubilization of sulfur compounds makes it sometimes green, sometimes with emerald reflexes . Blue Lake Natural Monument was declared natural rezervation and is in custody of Maramures Mountains Natural Park Administration in partnership with NGO which aims to conserve the landscape for s cientific and educational purposes . Blue Lake protected area is located on the territory of th
e city of Baia Sprie in a young oak forest on the southern slope of Mine Hill at an altitude of 530 m and has an area of ??0.5 ha . The lake formed by the collapse of old mine workings during 1919, 1920 . Around the lake there are a few samples of pine which give the area charm . Access to protected area : the city center Baia Sprie climb , behind the Catholic church , the street that leads us in the north direction to the edge of the forest , from here the trail climbs switchbacks up to Blue Lake , running time 45 min . - 1 hour
