http://www.rgzm.de/transportroutes/
It is a german one but very easy to understand. Click on a symbol for terra sigillata or a amphore on the map and you will see all the places they were found. If you look at the table in the lefter corner you can choose a production place and select another place were it can be traded. If you do this you can see the route and how high the transportation costs were. The costs were counted in a relation of 1:5:28 (Sea, Rivers, Land) and some other factors.




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