Karst is a unique landscape formed by the dissolution of soluble rocks, such as limestone, gypsum, or salt. This process creates features like caves, sinkholes, and underground rivers. Over time, rainwater, which is slightly acidic, seeps into the ground and erodes the rock, leading to the dramatic formations we see in karst regions. Famous examples include the Carlsbad Caverns in the United States and the Guilin mountains in China. Karst landscapes are not only beautiful but also important for ecosystems and water supply. The underground rivers and aquifers in these areas can provide fresh water for nearby communities. Additionally, karst regions often host unique flora and fauna, making them vital for biodiversity.