What are the map size description boundaries?

Which map sizes define a map as tiny, small, medium, etc when viewed in warcraft 3?

32x32 to 64x64 are considered tiny, 128x128 is considered small, 160x160 is medium, 192x192 and 224x224 are large, 256x256 is epic.

As far as I know, it's judged by area, not dimensions. So a 128x32 is still tiny.