The Illinois Border refers to the geographical boundaries that define the state of Illinois in the United States. It shares its borders with Wisconsin to the north, Iowa to the northwest, Missouri to the west, Kentucky to the south, and Indiana to the east. The border is marked by various natural features, including rivers like the Mississippi River and the Wabash River. The total length of the Illinois border is approximately 1,500 miles. This includes both land and water boundaries, which play a significant role in the state's transportation and trade. The border regions are also important for cultural exchange and economic interactions with neighboring states.