, ▁the ▁s lop es ▁are ▁composed ▁of ▁lim estone ▁and ▁ch alk y ▁rocks , ▁covered ▁with ▁sand y ▁lo am ▁and ▁lo am , ▁often ▁exposed ▁to ▁the ▁appearance ▁of ▁ancient ▁cry st all ine ▁rocks ; ▁in ▁other ▁areas ▁they ▁are ▁mostly ▁sand y ▁and ▁sand y . ▁In ▁the ▁upper ▁and ▁middle ▁streams ▁of ▁the ▁river ▁on ▁both ▁s lop es ▁( altern ating ▁along ▁the ▁banks ) ▁at ▁a ▁height ▁of ▁ 3 – 8 ▁m ▁above ▁the ▁river ▁are ▁located ▁terra ces , ▁wide ▁from ▁ 0 , 3 ▁to ▁ 4   km , ▁with ▁a ▁ste ep ▁led ge , ▁a ▁height ▁of ▁ 5 – 1 0 ▁m . ▁Their ▁surface ▁is ▁pre domin antly ▁smooth , ▁p low ed ▁, ▁rarely ▁covered ▁with ▁p ine ▁or ▁mixed ▁for ests . ▁ ▁In ▁the ▁upper ▁reaches ▁of ▁the ▁river ▁at ▁the ▁foot ▁of ▁the ▁s lop es ▁there ▁are ▁le aks ▁of ▁ground water . ▁ ▁In ▁the ▁upper ▁reaches ▁of ▁the ▁river , ▁the ▁flo od plain ▁is ▁water log ged , ▁is ▁covered ▁mostly ▁with ▁me adow - b og ▁veget ation , ▁less ▁often ▁with ▁shr ubs ▁and ▁individual ▁trees . ▁In ▁other ▁areas , ▁it ▁is ▁mostly ▁dry , ▁me adow , ▁strongly ▁over wh el med ▁by ▁el ders , ▁g ul lies ▁and ▁la kes , ▁along ▁the ▁banks ▁of ▁which ▁there ▁are ▁thick ▁thick ets ▁of ▁can e ▁and ▁shr ub ▁( will ow , ▁we eping