Limestone bluffs are steep, rocky formations made primarily of limestone, a sedimentary rock composed mainly of calcium carbonate. These bluffs often rise dramatically along riverbanks or coastlines, showcasing layers of rock that have been shaped by erosion and weathering over time. They can be found in various regions, providing unique habitats for plants and animals. The formation of limestone bluffs typically occurs in areas where water has eroded softer surrounding materials, leaving behind the more resistant limestone. These bluffs can also feature caves and sinkholes, which are common in karst landscapes. Their striking appearance makes them popular for outdoor activities like hiking and photography.