▁ 2 0 ▁highest ▁mountains ▁in ▁the ▁All g äu ▁Al ps . ▁Despite ▁its ▁importance ▁the ▁Horn bach ▁chain ▁is ▁rather ▁isolated . ▁Its ▁summ its ▁consist ▁of ▁main ▁dol om ite . ▁Its ▁pe aks ▁and ▁high ▁cir ques ▁alternate ▁in ▁exempl ary ▁fashion . ▁Many ▁– ▁also ▁very ▁high ▁– ▁summ its ▁in ▁the ▁Horn bach ▁chain ▁receive ▁only ▁a ▁few ▁vis its ▁per ▁year . ▁ ▁Territ orial ▁division ▁ ▁The ▁All g äu ▁Al ps ▁as ▁a ▁ge ographical ▁unit ▁and ▁mountain ▁range ▁of ▁the ▁Al ps ▁span ▁two ▁countries ▁and ▁four ▁federal ▁states . ▁The ▁Bav arian ▁portion ▁accounts ▁for ▁slightly ▁more ▁than ▁half ▁of ▁the ▁total ▁area ▁and ▁coinc ides ▁to ▁a ▁large ▁extent ▁with ▁the ▁catch ment ▁area ▁of ▁the ▁River ▁Ill er . ▁The ▁Baden - W ür ttemberg ▁portion ▁compr ises ▁only ▁the ▁extreme ▁north west ▁of ▁the ▁All g äu ▁Al ps , ▁in ▁its ▁bro ader ▁sense , ▁by ▁the ▁A de leg g . ▁The ▁Ty role an ▁portion ▁largely ▁compr ises ▁the ▁Le ch ▁river ▁and ▁its ▁trib ut aries ▁and ▁the ▁Vor ar l berg ▁part ▁cent res ▁on ▁the ▁catch ment ▁area ▁of ▁B reg en zer ▁Ach . ▁ ▁At ▁one ▁point , ▁the ▁three ▁states ▁of ▁Bav aria , ▁Ty rol ▁and ▁Vor ar l berg ▁meet . ▁This ▁tri point ▁( D re il änder punkt ) ▁is ▁relatively ▁uns pect ac ular . ▁It ▁is ▁located ▁a ▁few ▁metres ▁west ▁of ▁the ▁Ge