The geography of Illinois features a diverse landscape that includes plains, hills, and rivers. The state is primarily flat, with the Central Lowland region dominating the area. The Illinois River flows through the state, connecting to the Mississippi River to the west, while the Great Lakes lie to the northeast. Illinois has a varied climate, with cold winters and hot summers. The state is home to several natural regions, including the Driftless Area in the northwest, characterized by rugged terrain. Additionally, Illinois has numerous parks and forests, such as Shawnee National Forest, which showcase its natural beauty.