To expand on Jaerdaph's post, in the overland maps, no the symbols won;t scale overly much as they are representitive (as he said, a Mountain could represent a few real world mountains), but in the Dungeon and City Map (the feet as opposed to miles maps) the symbols will scale. Check it out by making a 1000 x 1000 dungeon map and a 100 x 100 dungeon map and then place some furniture to see what I mean.