itz ▁( west ) ▁and ▁Ro hr sp itz ▁( east ). ▁ ▁Geography ▁ ▁The ▁delta ▁of ▁the ▁Al pine ▁Rh ine ▁forms ▁a ▁common ▁delta ▁area ▁with ▁the ▁eastern ▁del t as ▁of ▁the ▁rivers ▁D orn bir ner ▁Ach ▁and ▁B reg en zer ▁Ach . ▁In ▁the ▁north , ▁the ▁border ▁of ▁the ▁Rh ine ▁delta ▁runs ▁along ▁the ▁shore ▁of ▁Lake ▁Const ance . ▁The ▁southern ▁border ▁depends ▁on ▁the ▁course ▁of ▁Lake ▁Const ance ▁after ▁the ▁mel ting ▁of ▁the ▁Rh ine ▁gla cier . ▁It ▁is ▁usually ▁at ▁least ▁a ▁few ▁kilom eters ▁long . The ▁area ▁covers ▁an ▁area ▁of ▁ 2 , 0 6 5 ▁hect ares , ▁of ▁which ▁ 1 , 9 6 0 ▁hect ares ▁are ▁on ▁Aust rian ▁territory . ▁About ▁two ▁third s ▁of ▁the ▁Rh ine ▁delta ▁consists ▁of ▁water ▁( 1 , 3 0 0 ▁hect ares ), ▁which ▁generally ▁has ▁a ▁depth ▁of ▁just ▁a ▁few ▁meters . ▁ ▁Nature ▁park ▁ ▁The ▁Rh ine ▁delta ▁is ▁the ▁largest ▁wet land ▁bi ot ope ▁reserve ▁on ▁Lake ▁Const ance ▁and ▁extends ▁from ▁the ▁mouth ▁of ▁the ▁Alter ▁Rhein ▁over ▁the ▁mouth ▁of ▁the ▁Ne uer ▁Rhein ▁to ▁the ▁D orn bir ner ▁Ach ▁in ▁Hard ▁( Vor ar l berg ). ▁Both ▁Austria ▁and ▁Switzerland ▁have ▁each ▁designated ▁the ▁area ▁as ▁a ▁nature ▁reserve . ▁ ▁Due ▁to ▁its ▁great ▁e colog ical ▁importance , ▁the ▁Vor ar l berg ▁area ▁of ▁the ▁Rh ine ▁delta