▁with ▁orch ards ▁or ▁small ▁clusters ▁of ▁trees . ▁ ▁Of ▁the ▁agricult ural ▁land , ▁ 4 0 . 9 % ▁is ▁used ▁for ▁growing ▁cro ps ▁and ▁▁ 1 0 . 6 % ▁is ▁past ures . ▁ ▁All ▁the ▁water ▁in ▁the ▁municipality ▁is ▁flow ing ▁water . ▁ ▁Schwar zh ä us ern ▁lies ▁in ▁the ▁Ober a arg au ▁in ▁the ▁Swiss ▁plate au ▁on ▁the ▁left ▁bank ▁of ▁the ▁A are ▁and ▁the ▁border ▁with ▁the ▁C anton ▁of ▁Sol oth urn . ▁ ▁It ▁consists ▁of ▁the ▁village ▁of ▁Schwar zh ä us ern ▁and ▁the ▁ham lets ▁of ▁R uf sh us en ▁and ▁Mo os bach ▁as ▁well ▁as ▁scattered ▁farm ▁houses . ▁ ▁At ▁the ▁southern ▁end ▁of ▁the ▁municipality ▁the ▁A are ▁has ▁a ▁res er voir ▁created ▁by ▁the ▁hydro elect ric ▁plant ▁of ▁W yn au . ▁ ▁On ▁ 3 1 ▁December ▁ 2 0 0 9 ▁Amts bez irk ▁A ar w angen , ▁the ▁municipality ' s ▁former ▁district , ▁was ▁dissol ved . ▁ ▁On ▁the ▁following ▁day , ▁ 1 ▁January ▁ 2 0 1 0 , ▁it ▁joined ▁the ▁newly ▁created ▁Verwalt ung sk re is ▁Ober a arg au . ▁ ▁Co at ▁of ▁arms ▁The ▁bla zon ▁of ▁the ▁municipal ▁coat ▁of ▁arms ▁is ▁Argent ▁on ▁a ▁Base ▁Vert ▁two ▁H ouses ▁S able ▁and ▁in ▁chief ▁a ▁Mul let ▁Azure . ▁ ▁This ▁is ▁an ▁example ▁of ▁cant ing ▁with ▁two