Danau is the Indonesian word for "lake," referring to a large body of freshwater surrounded by land. Lakes can vary in size and depth and are often formed by natural processes such as glacial activity, tectonic movements, or volcanic eruptions. They play a crucial role in local ecosystems, providing habitats for various species of fish, birds, and plants. In Indonesia, there are many beautiful danau, such as Danau Toba, the largest volcanic lake in the world, and Danau Bratan, known for its stunning temple on the water. These lakes are popular tourist destinations, offering recreational activities like fishing, boating, and hiking.