The land surface processes as parameterized for the current version of the L.M.D. General Circulation Model are described. The model predicts ground temperature for bare soil, ice and snow; the treatment of ground hydrology involves a prediction of soil moisture and snow depth. The parameterization is tested on a 90-day integration using a sectorial model with artificial modelling of continents and orography; sea surface temperature, surface albedo and ice cover are given assigned values based on climatological data for January. The resulting distributions of hydrological and thermodynamic variables at the Earth's surface are discussed.