Another major habitat feature is the vast northern lowlands. Stretching for hundreds of kilometers, these include lowland rainforests, extensive wetlands, savanna grasslands, and some of the largest expanses of mangrove forest in the world. The northern lowlands are drained principally by the province's largest river, the Mamberamo River and its tributaries on the western side, and by the Sepik on the eastern side. The result is a large area of lakes and rivers known as the Lakes Plains region.
Another major habitat feature is the vast northern lowlands. Stretching for hundreds of kilometers, these include lowland rainforests extensive wetlands, savanna grasslands, and some of the largest expanses of mangrove forest in ,the world. The northern lowlands are drained principally by the province's largest riv.er, the Mamberamo River and its tributaries on the western side, and by the Sepik on the eastern side. The result is a large area of lakes and rivers known as the Lakes Plains region