, ▁which ▁is ▁just ▁under ▁ 5 0 0   km ² ▁in ▁area , ▁and ▁in ▁which ▁the ▁Dam me ▁Hills ▁and ▁St em w eder ▁Berg ▁form ▁the ▁central ▁elements ▁of ▁the ▁landscape . ▁ ▁The ▁open ▁water ▁of ▁the ▁lake ▁belongs ▁entirely ▁to ▁the ▁district ▁of ▁Die ph ol z , ▁but ▁on ▁its ▁western ▁shore ▁the ▁district ▁of ▁V ech ta ▁extends ▁up ▁to ▁the ▁dy ke ▁for eland . ▁Near ▁D ü m mer lo hausen ▁the ▁district ▁boundary ▁comes ▁within ▁a ▁few ▁metres ▁of ▁the ▁sh or eline . ▁To ▁the ▁south west ▁by ▁the ▁mouth ▁of ▁the ▁River ▁Hun te ▁a ▁tip ▁of ▁the ▁territory ▁of ▁the ▁district ▁of ▁Os nab r ück ▁adv ances ▁to ▁within ▁half ▁a ▁kilomet re ▁of ▁the ▁lake . ▁Wh ilst ▁Die ph ol z ▁district ▁belonged ▁to ▁the ▁Elect or ate ▁of ▁Han over ▁from ▁ 1 5 8 5 ▁( Count y ▁of ▁Die ph ol z ) ▁and ▁ 1 5 8 2 ▁( Count y ▁of ▁Ho ya ), ▁the ▁territory ▁of ▁the ▁district ▁of ▁V ech ta ▁belonged ▁for ▁centuries ▁to ▁the ▁Dioc ese ▁of ▁Mün ster ▁and ▁only ▁became ▁part ▁of ▁Old enburg ▁in ▁ 1 8 0 3 ▁after ▁the ▁ ▁German ▁Med iat isation . ▁Hence ▁it ▁counts ▁as ▁part ▁of ▁Old enburg ▁Mün ster land . ▁ ▁Character ▁▁ ▁The ▁D ü m mer ▁is , ▁after ▁the ▁Stein h uder ▁Me er , ▁the ▁second ▁largest ▁lake ▁in ▁Lower ▁Sax