Sauerland is a map that is approx 3 times larger than Chernarus, at 655 sq.km, versus Chernarus at 225 sq.km.
{Link to the official site}The largest city here, Meschede, is also about 3-4x the size of Chernogorsk; I had done a little run from Pobeda Bay, very north, all the way down to Chernogorsk and back, with an Armored SUV, and used half of a fuel tank. This would give a much larger use to fuel trucks and whatnot, and also a lot of traveling to do to get to oneanother.
I suppose this could stay around for a while, so everyone can get a feel of what the map would be like.
From what I understand, DayZ Epoch already includes this map, so no download from clientside is needed; this information came from the Epoch Wiki, under 'Included Custom Islands.'
tl;dr: Lets give Sauerland a shot?