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Catchments of the small rivers are usually stated in one hydrological zone, but regime of each river can differ from zonal regime under the local landscape factors. Two neighbor rivers can have different flow rate values and chemical composition of the water because of landscape differences between their watersheds. To determine the effect of landscape factors authors have done a hydrological and hydrochemical survey on Zayachya river watershed (tributary of the Kokshenga river, Northern Dvina basin) in the southern part of the Arkhangelsk region. At the study area Zayachya river has 8 tributaries with various landscape features on their catchments. Study area was surveyed in field trips, which are held since 2013 during all phases of water regime. Collected material to date allows to evaluate features of rivers runoff and chemical composition for low-water period, which is good for comparison of rivers because of homogeneity of runoff formation. Low-water periods flow rate of different Zayachyariver tributaries may differ by more than ten times. Mineralization of each river may also differ by several times. Main ions in chemical composition are HCO₃⁻, Ca2+and Mg2+. The highest water mineralization corresponds to the rivers with catchments under the plowing.