There are numerous water resources in the northeast [i.e. southeast] Ljubljana basin which differ significantly as to their dynamic reserves, mode of resupply, baseflow speed, depth and permeability of cover layer, and quality. By suitability of these water resources for drinking water supply they are divided to six groups. It is necessary to provide about 1.5m3/s of drinking water for the supply of Ljubljana, and in case of pollution it would be very hard to substitude for the groundwater of the Ljubljansko Polje. In the southeast Ljubljana basin, the aquifers in nonconsolidated sediments have the greatest dynamic reserves of drinking water. Selected for the assessment of landscape sensitivity were four of them: the Ljubljansko Polje and the Iška alluvial fan as the areas of current drinking-water resources, and the Sorško Polje and the Ljubljansko Barje as the areas of possible resources. It has been established through the evaluation of selected physicogeographical features of the environment with groundwater that the Ljubljansko Barje is water-ecologically least sensitive, next come the Ljubljansko Polje and the Sorško Polje, while the Iška alluvial fan is the most sensitive environment with groundwater.