▁in ▁the ▁canton ▁of ▁Bern , ▁Switzerland . ▁It ▁consists ▁of ▁a ▁closed ▁part ▁and ▁a ▁number ▁of ▁minimum ▁security ▁habit ation ▁units . ▁The ▁prisoners ▁work ▁on ▁the ▁institution ' s ▁huge ▁farm ▁estate ▁on ▁the ▁territ ories ▁of ▁the ▁municipal ities ▁Er lach , ▁G amp elen ▁and ▁Ins ▁in ▁C anton ▁of ▁Ber ne ▁and ▁Haut - V ul ly ▁in ▁C anton ▁of ▁F rib ourg . ▁Form er ▁prisoners ▁who ▁are ▁yet ▁to ▁find ▁employ ment ▁are ▁also ▁allowed ▁to ▁work ▁on ▁these ▁far ms . ▁▁ ▁The ▁main ▁seat ▁and ▁official ▁address ▁are ▁located ▁in ▁the ▁community ▁of ▁G amp elen . ▁ ▁History ▁The ▁W itz w il ▁prison ▁was ▁a ▁brain child ▁of ▁Otto ▁K eller h als , ▁who ▁also ▁served ▁as ▁the ▁institution ' s ▁first ▁director ▁in ▁ 1 8 9 5 . ▁His ▁son ▁Hans ▁K eller h als ▁took ▁over ▁after ▁his ▁ret irement . ▁▁ ▁The ▁far ms ▁of ▁the ▁prison ▁are ▁on ▁what ▁was ▁formerly ▁a ▁part ▁of ▁the ▁huge ▁mar sh lands ▁called ▁Grand ▁Mar ais . ▁It ▁was ▁realized ▁that ▁the ▁land ▁parc els ▁could ▁be ▁rec laimed ▁for ▁agricult ure ▁through ▁the ▁J ura ▁water ▁correction . ▁In ▁ 1 8 6 0 ▁Public ▁Not ary ▁W itz ▁from ▁Er lach ▁bought ▁the ▁whole ▁land , ▁which ▁hence for th ▁took ▁up ▁his ▁name . ▁In ▁ 1 8 7 0 ▁he ▁sold ▁it ▁to ▁the ▁newly ▁founded ▁Land wirtschaft lichen ▁Gesellschaft ▁W itz w