Very nice reconstruction. The fort is actually in South Shields, about 6 miles east of Newcastle-upon-Tyne and was a granary and guard post for the river Tyne. Being on the opposite side of the river to the east end of Hadrian's Wall (Wallsend), it was on the northern border of the (then) Roman Empire. I grew up in the town and visited a few times.
The area is now known as the "Lawe Top" and was once part of a river delta. Probably at the time of the Romans it may have been an Island.