This being a draft, I haven't added smaller elements like rivers, lakes etc. except for where they play a part in the faction terrain.
Blue (mountains) - mostly mountainous terrain, a bit of forest in the bay to the west.
Red (grasslands/desert) - fertile soil around the big river, otherwise grasslands and desert (the ///s). To the west is a large peninsula with a volcano.
Green (forest/foothills) - a large forest surrounding a giant lake, foothills to the east leading up to a rocky area towards the coast.
Gold, rebels/magic - an Island with varied terrain. I didn't include their mainland location, but it can be added various places.