It is a large swamp with numerous cold caves and a very wet landscape. Dense fog can make visibility low in some areas. In other areas, the ground is too mushy to lay down pitfall traps. The numerous caves, while freezing, hold large clusters of beautiful crystals. In the northwestern areas, the rolling thunder of a distant storm can be heard. The Old Swamp is teeming with insect, plant and mushroom gathering spots. In most areas of this environment a blue tinge is visible in the sky and fog.
Bullfango, Velociprey, Giaprey, Genprey, Ioprey, Melynx, Kelbi, Vespoid, Hornetaur, Aptonoth, Mosswine
Gendrome, Gypceros, Purple Gypceros, Basarios, Gravios, Rathalos, Azure Rathalos, Silver Rathalos, Rathian, Pink Rathian, Gold Rathian, Khezu, Red Khezu, Terra Shogun Ceanataur, Kirin, Nargacuga, Shogun Ceanataur