Beaufort-en-Vallée(France)
Editor of DKAR 1:58 identifies Monnet as in arrondisement of Beaugé/Baugé, which was abolished in 1926. Editor of cartulary of Saint-Aubin identifies Multonacus as Monnet in commune of Beaufort-en-Vallée (formerly in arrondisement of Beaugé).
Berg(Germany)
in Lower Bavaria, to Pocking, district Passau
Bondeno (river)(Natural Landmark)
Right tributary of Po, now partially disappeared.
Bouchemaine(France)
According to French Wikipedia, the modern commune consists of three villages: Pruniers, Bouchemaine et la Pointe. Editor of DKAR 1:58 identifies Pruniers with Prunarius.