A polje is a large, flat valley that is typically found in karst regions, characterized by limestone formations. These valleys are formed through the processes of erosion and subsidence, often resulting in a landscape that can be quite fertile. Poljes can be filled with soil and water, making them suitable for agriculture and supporting various ecosystems. In many cases, poljes are bordered by steep cliffs or hills, which can create stunning natural scenery. They often contain rivers or streams that flow through them, contributing to the unique hydrology of the area. Notable examples of poljes can be found in regions like Bosnia and Herzegovina and Montenegro.