▁according ▁to ▁present - day ▁understanding , ▁is ▁( al most ▁entirely , ▁but ▁see ▁T ann heimer ▁Tal ) ▁on ▁German ▁soil . ▁By ▁contrast , ▁the ▁All g äu ▁Al ps ▁are ▁a ▁mountain ▁range ▁of ▁the ▁Al ps ▁whose ▁definition ▁falls ▁out ▁of ▁the ▁Al pine ▁Club ▁classification ▁of ▁the ▁Eastern ▁Al ps . ▁Part s ▁of ▁the ▁All g äu ▁Al ps , ▁including ▁its ▁highest ▁sum mit , ▁lie ▁on ▁Aust rian ▁soil . ▁The ▁All g äu ▁region , ▁however , ▁extends ▁far ▁beyond ▁the ▁All g äu ▁Al ps ▁to ▁the ▁north ▁and ▁north west . ▁ ▁Ne igh bour ing ▁ranges ▁ ▁The ▁All g äu ▁Al ps ▁border ▁on ▁the ▁B reg enz ▁Forest ▁Mountains ▁in ▁the ▁west , ▁the ▁Le ch qu ellen ▁Mountains ▁in ▁the ▁south west , ▁the ▁Le cht al ▁Al ps ▁in ▁the ▁south ▁and ▁sout heast ▁and ▁the ▁Am mer g au ▁Al ps ▁in ▁the ▁east . ▁All ▁these ▁ranges ▁belong , ▁like ▁the ▁All g äu ▁Al ps ▁themselves , ▁to ▁the ▁Northern ▁Lim estone ▁Al ps . ▁In ▁the ▁north ▁the ▁All g äu ▁Al ps ▁give ▁way ▁to ▁the ▁Al pine ▁For eland . ▁ ▁B ound ary ▁ ▁The ▁boundary ▁of ▁the ▁range ▁is ▁only ▁un ambigu ously ▁clear ▁in ▁the ▁east , ▁sout heast ▁and ▁south . ▁The ▁River ▁Le ch ▁forms ▁the ▁boundary ▁here ▁from ▁where ▁it ▁leaves ▁the ▁Al ps ▁and ▁enters ▁the ▁Al pine ▁For eland ▁near ▁F üssen