Lacul Roșu (locally also known as Lacul Ghilcoș) is a natural dam lake formed following the collapse of a slope due to the earthquake of January 23, 1838, at 18.45. 6.9 magnitude, VIII intensity [1], at the foot of Hășmașul Mare Mountain, near the Bicaz Gorges, at a distance of 26 km from Gheorgheni, in Harghita County. At the last measurements, carried out in 1987, its dimensions are: the lake covers a perimeter of 2,830 m, the area is 114,676 m67 and the volume of water that accumulates is 587,503 m². The lake formed at an altitude of 983 m, in a depression with a predominantly subalpine climate.
