Nijmegen is an ancient city just inside the eastern border of The Netherlands.
It's just downstream from the split in the Rhine as it goes delta, and on the south bank of the river Waal, which in modern times carries 2/3 its flow.
Nijmegen stands at the foot of a Pleistocene terminal morraine, and at 32 meters in elevation, the main old city is well above the delta flatland which explains its great antiquity in a flat and watery region.
The Romans moved in amongst the Batavians.
Nijmegen became an important Roman trading and a military post, then an official municipality at the northern extent of the empire.