Abstract: Red Lake in the Hăşmaş (Curmăturii) Mountains was formed by the natural barrage of the Bicaz brook in 1837. The north-western slope of the Ghilcoş Mountain, covered with gravel, slide as a result of the alteration layer water saturation following the abundant rains in that period. The lake has an „L” shape, or the shape of a leg with the foot oriented towards north. Red Lake is supplied by several brooks with permanent character: Oii, Ghilcoş, Vereşcheu, Suhard. As a result of the measurements we made in the summer of 2009, using Leica Total Station and sonar, the following data were obtained: area 12.01 hectares; perimeter 2905.79 m; maximum length 1361.72 m; maximum width 160.24 m; maximum altitude upstream in the south 965.199 m; maximum altitude upstream in the north 966.041 m; maximum depth 10.50 m etc. The greatest depths, of 10.5 m, are recorded in the central sector, close to the outlet of the two arteries. In a transversal profile, the western bank is steeper and hard (lithologically), and the eastern bank is mild and crumbly (landslide diluvium). In the same way the submerse slopes are maintained as well. New techniques of analysing the hydro-morphological parameters for a lacustrine basin have been used. Methods specific to land geomorphology (slope inclination, slope orientation etc) have also been used. The cartographic representation, as a new thing in the field, is suggestive, and helps in elaborating an interdisciplinary interpretation, of a limno-ecological nature.