Ulisses has released a pack of maps covering Aventuria.

Here is the entry :
http://www.ulisses-spiele.de/index.php?id=3&tx_ttnews[tt_news]=494&tx_ttnews[backPid]=2&cHash=16d0ccaf05

(I hope this link works, otherwise you need to do simple copy & paste.)

The link contains the terms and conditions under which this mappack can be used.

The pack as such can be downloaded from there via the link called "Kartenpaket".
It is around 50 MB big.

Direct link : http://www.dasschwarzeauge.de/filead…artenpaket.zip

The map containing Ferdok and the area around both Drakensang games is covered by the file called "Das Zentrale Mittelreich.jpg"