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Lake Calabazosa (aka Lake Negro)
Somiedo (Central Asturias)
17 Ha. km2
Maximum elevation
1.610 m.
Lago Negro
  • All the lakes that make up the Saliencia Lakes are accessible by car

  • Plant life

    The aquatic fauna include Gammarus lacustris, a carnivorous crustacean characteristic of very pure waters, as well as the leech Erpobdella monostriata. There are also other leeches (Helobdella stagnalis and Haemopis sanguisuga), molluscs (bivalve and gastropod), Odonata (Aeschna juncea), caddisflies, chironomid flies and amphibians (Bufo bufo).


    Sparse grassland dominates in the lake basin, along with thorny shrub, Cistaceae, dwarf juniper and Arctostaphyllos uva-ursi.

    The aquatic vegetation that can be found in the lake corresponds to rooting plants, with a scant variety of species: the small size charophyte algae (Chara and Nitella), the two species of Potamogeton, some amphibious species such as Ranunculus and Rorippa, and mosses. The proliferation of filamentous algae, as well as other planktonic algae, very apparent in the shoreline zone, contributing to the greenish hue of the waters due to their transparency, may be sustained by the nutrients provided by livestock, although there is less pastoralism here than at other lakes in the region.

Lake Negro is nestled in a huge limestone cirque, located in a valley that stretches about 5 km, which is also home to Lake Cerveriz and represents the largest natural watershed in the region. It does not quite double the capacity, but does exceed the depth of the neighbouring Lake El Valle, while being shorter in length due to the artificial expansion of the latter.

The basin is fully closed off, having no other outflow than the run-off pipe leading to Lake Cueva, being fed by several streams that provide 5 to 15 litres of water per second.

It is currently the deepest lake in Asturias, its level descending up to 9 m because of its use.

Its waters are colourless, offering a bluish-green hue due to reflection. Two inverse thermal stratifications exist in this lake, one in winter and another in summer. In the coldest period, the surface temperature is lower than in the depths, while in the hottest period the cool waters sink and remain in the deeper areas.

These thermal features correspond to what are known as temperate lakes, found in regions where pronounced seasonal differences occur, where the bodies of water sometimes remain stabilized at different temperatures, while presenting vertical circulation at other times.

Lake Calabazosa (aka Lake Negro)