The most popluar map from Supreme Commander and Supreme Commander Forged Alliance returns. It appears to have the same characteristics of the original, but is much, much smaller and the land is extended in the Northeast and the Southwest of the map to reveal new mountainous terrain. It is not possible for land units to tranverse this. See the old Seton's Clutch on the Supreme Commander Wiki.
Also, in the small pools of water you can build a single Sea Factory but will only work if you are Cybran and requires L.E.G.S. Aka