What are physical landmarks in Indiana?

Physical landmarks in Indiana include features such as the rolling hills of the Appalachian Plateau in the south, the flat plains of the Central Lowlands, and the sandy dunes along Lake Michigan. Notable natural sites include the Hoosier National Forest, Brown County State Park, and the Indiana Dunes National Park. The Wabash River, which is the longest river in Indiana, also serves as a significant geographical feature. These landmarks contribute to the state's diverse ecology and scenic beauty.