3 Player Maps?

I usually play AoE3:DE with my two brothers. We play with all sorts of civs but usually play longer treaty-esque games where we give each other plenty of time to age up and build up our bases before the fighting starts.

My question is, which maps work well with only 3 players? Most are (understandably) angled towards 2 teams, and these maps will plop the 3rd player in an odd spot off to the side, or in a corner with limited space. We're getting a little bored of the same couple of maps (Great Plains, Great Lakes, Himalaya). Obviously any map with a single trade route down the centre won't work as it jams 2 players on one side.

We haven't tried every map in the game yet to see where the player spawns are, but does anyone have any in mind that might work well?