Learn about the geography of Wisconsin with these interesting facts. The state borders Lake Michigan, the Montreal River, and Illinois. Its border with Minnesota was disputed and settled in two court cases in 1934 and 1935. Other boundaries of Wisconsin include the Mississippi River in the west and the St. Croix River in the east. You can also explore its rich history by visiting the Sinsinawa Mound. You can learn about Wisconsin's unique heritage by visiting the Sinsinawa Mound. One of the most popular exports from Wisconsin is cranberries, which make up 60% of the state's crops. The state is the toilet paper capital of the world. It is also the leading producer of cheese in the United States. A New York Times book on Wisconsin cheese describes the state's cranberry production as "self-depreciating, goofy, and proud". With over 8,400 milking cows in its dairy fields, the state is the nation's largest producer of cheese. The state motto, Forward, has been adopted by many nations. The official state insect is the honeybee, the state bird is the robin, and the state tree is the sugar maple. The state's largest city is Madison, and its largest university is the University of Wisconsin. Wisconsin's borders include the states of Minnesota and Michigan. While the state is largely flat, it has a few notable landmarks. The oldest state park, Devil's Lake, is home to the state's oldest state park.