The small Lolair lake is situated at 1,175m of height, is fed by three springs and surrounded by a large cane-brake and by characteristic rounded and smooth knolls of glacial origins. The lake houses a rich plankton population, which in the region is comparable only with the one in Lozon, and a very important vegetation.
The pond houses several floating species, like the Broad-leaved Pondweed (Potamogeton natans) and the Bladderwort (Utricularia australis); near the banks and the channels there is the Bogbean (Menyanthes trifoliata) and along the streams there are rich populations of Marsh-marigold (Caltha palustris) and Water Avens (Geum rivale). The dry western side is characterized by xerophile vegetation, with bushes of Juniper (Juniperus sabina), flowerings of Common Rock-rose (Helianthemum nummularium) and the fields that have been abandoned for a long time, the main Alpine station of the very rare Potentilla pensylvanica.