ise ▁ten ▁sub groups : ▁the ▁Horn bach ▁chain , ▁Hö f ats ▁Group , ▁Da umen ▁Group , ▁Ro ß z ahn ▁Group , ▁V ils al p see -( Le il ach ) ▁Group , ▁the ▁mountains ▁between ▁Bre it ach ▁and ▁St illa ch ▁( Sch af al pen ▁and ▁W arm ats g und ), ▁the ▁Wal sert al ▁Mountains ▁( W al sert aler ▁Ber ge ) ▁left ▁of ▁the ▁Bre it ach , ▁fo oth ills ▁west ▁of ▁the ▁Ill er , ▁fo oth ills ▁east ▁of ▁the ▁Ill er ▁and ▁the ▁T ann heim ▁Mountains ▁( T ann heimer ▁Ber ge ). ▁ ▁The ▁current , ▁ 1 6 th ▁edition , ▁of ▁the ▁Al pine ▁Club ▁Guide ▁for ▁the ▁All g äu ▁Al ps ▁adopt s ▁a ▁co ar ser ▁division ▁into ▁only ▁twelve ▁sub groups . ▁A ▁direct ▁comparison ▁between ▁the ▁sub groups ▁of ▁the ▁old ▁schema ▁and ▁the ▁sub div isions ▁of ▁the ▁new ▁one ▁is ▁not ▁possible , ▁because ▁the ▁boundaries ▁between ▁the ▁sub groups ▁have ▁been ▁red ra wn ▁in ▁places . ▁ ▁All g äu ▁Pre al ps ▁west ▁of ▁the ▁Ill er ▁ ▁The ▁southern ▁boundary ▁of ▁this ▁sub range ▁runs ▁from ▁Ober std orf ▁via ▁Ro hr mo os ▁to ▁S ibr ats g f äll . ▁Its ▁highest ▁peak ▁is ▁the ▁Hoch gr at , ▁. ▁These ▁mountains ▁are ▁a ▁popular ▁walking ▁area . ▁Its ▁rock ▁formation ▁is ▁varied . ▁In ▁the ▁north ▁it ▁is ▁domin ated