The morphometry of the Cubolta and Căinar hydrographic basins under specific conditions of the environment in the XXth century. The content of this scientific material reflects the results of the researches relating to the development of the morphometry of the Cubolta and Căinar hydrographic basins under specific conditions of the environment. Through cartographic materials and strings representation of data (number of tanks of different orders, summed and average areas of rivers’ basins) in logarithmic coordinates, with reference to the years 1913 and 1986, are shown the changes over time. Particular emphasis is placed on the role of the environmental factors which have accelerated the processes of erosion or have had an important role in maintaining a natural balance in the Cubolta and Cainar basins.