The Missouri Border refers to the boundary that separates the state of Missouri from its neighboring states. It is defined by both natural features, such as rivers, and man-made lines. The border is approximately 1,200 miles long and touches Iowa to the north, Illinois to the east, Kentucky to the southeast, Tennessee to the south, Arkansas to the southwest, and Oklahoma to the west. The Missouri River is a significant geographical feature along the border, particularly with Iowa and Nebraska. This river has played a crucial role in the state's history, serving as a transportation route and a natural resource. The border also influences trade, culture, and transportation between Missouri and its neighboring states.