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Marshes are part of the ExtrabiomesXL mod.

Marshes are extremely flat with little, if any, elevation. They are mostly composed of an equal amount of water and grass blocks, There are no trees in marshes; mostly grasses grow there. It is not recommended to live here, as there is not much land to build on, and the excessive patterning causes lag on some computers. Typically try to avoid them, as they are quite hard to traverse as well.  Interestingly, they seem to generate as five blocks of grass blocks mixed with five blocks of water. Villages can be found here rarely. 

ExtrabiomesXL Biomes
Hot 16px Mountain Desert16px Mountain Ridge16px Savanna16px Wasteland
Warm 16px Extreme Jungle16px Mini Jungle
Normal Autumn Woods.png Autumn Woods16px Birch Forest16px Forested Hills16px Forested Island16px Green Hills16px Green Swamplands16px Marsh16px Meadow16px Pine Forest16px Rainforest16px Redwood Forest16px Redwood Lush16px Shrubland16px Temperate Rainforest16px Woodlands
Cold 16px Snow Forest16px Snowy Rainforest
Icy 16px Alpine16px Glacier16px Ice Wasteland16px Mountain Taiga16px Tundra