The plains west of Pravend City are all treated as forest when calculating the party movement speed. But there are no forest as the area are plains like I said. This goes for the mainland west of Pravend as well as for the peninsula south-west of the city and occurs all over the area, not only in special locations.
Terrain penalty while moving in plains, normal speed is 6.1
Terrain penalty while moving in plains, normal speed is 6.1