But the question is: does this apply to the landscape of 2300 years back? For instance, if someone took a look at a modern map of the Netherlands surely he'd wonder why the Waal isn't included? Yes, it's true the Waal did exist back then. But no, it was definitely not the main stream; the main stream of back then is now almost 'dead': Kromme Rijn and Leidse Rijn.