th ▁district ▁of ▁Vienna . ▁It ▁is ▁also ▁one ▁of ▁the ▁ 8 9 ▁Kat astr alg eme inden . ▁ ▁Geography ▁ ▁The ▁Kat astr alg emeinde ▁Unter d ö bling ▁lies ▁in ▁D ö bling , ▁the ▁ 1 9 th ▁district ▁of ▁Vienna , ▁to ▁the ▁north ▁of ▁Ober d ö bling . ▁The ▁border ▁between ▁Unter d ö bling ▁and ▁Ober d ö bling ▁is ▁largely ▁determined ▁by ▁the ▁K rott en bach , ▁a ▁stream ▁which ▁today ▁serves ▁as ▁a ▁canal . ▁The ▁medieval ▁town ▁centre ▁lay ▁in ▁a ▁dip ▁by ▁the ▁stream , ▁where ▁now ad ays ▁the ▁Rudolf iner g asse ▁and ▁the ▁N uß wald g asse ▁( which ▁used ▁to ▁be ▁called ▁the ▁Herr eng asse ) ▁lie . ▁In ▁more ▁recent ▁times , ▁settlement ▁took ▁place ▁on ▁the ▁plate au ▁that ▁r ises ▁slowly ▁to ▁the ▁west ▁and ▁to ▁the ▁north ▁towards ▁the ▁K ahlen berg . ▁Unter d ö bling ’ s ▁southern ▁border ▁runs ▁alongside ▁Ober d ö bling , ▁in ▁the ▁west ▁it ▁borders ▁on ▁Un ters ie ver ing ▁and ▁in ▁the ▁north ▁on ▁Gr in zing ▁as ▁well ▁as ▁on ▁parts ▁of ▁Heil igen stadt . ▁The ▁eastern ▁border ▁is ▁marked ▁by ▁a ▁road ▁leading ▁from ▁Ober d ö bling ▁via ▁the ▁Ho he ▁War te ▁to ▁Heil igen stadt . ▁ ▁History ▁ ▁The ▁origin ▁of ▁the ▁name ▁D ö bling ▁▁ ▁D ö bling ▁is ▁mentioned ▁for ▁the ▁first ▁time ▁in ▁an ▁official ▁document ▁in ▁