Dutch, Q-line Defence line from Delfzijl-Hoogeveen.
During the initial stage of WW2 the Dutch military build along there east borders and often along rivers and streams, small MG bunkers of the type "Stekelvarken-kazemat" or "S-kazemat". There where build over 700 of these simple bunkers all over the country an you can encounter them everywhere.
Start at the Wijmeesterbrug and follow the canal to the south.
5x Dutch Stekelvarken-kazemat.