The size is 1500x1500 km
The reason why I didn't included a bigger part of Eastern Europe is because the original idea was just to make a refurbishment of the original EAW europe terrain during the cold war with SF2 standards. However since the EAW terrain is a "peculiar" one (It has a 1500 x 1500 km size but only a 55% is actually "flyable" ( When I say "flyable" I mean that only that 55% of the whole terrain has a non 0 height field ), I said to me : "Well, I have done a lot of work here, but I want to expand the height file since I have room, but ,I don't want to loose the original work (Hand tiling, target locations etc)".
So I've adapted the original work with a new HFD file that now covers the 100% of the 1500 x1500 terrain, and since the orignal terrain was designed for a WWII action (mainly in France and the South of the UK) that's why only a small part of east europe is covered.