A rift valley is a lowland region formed by the movement of tectonic plates. As these plates pull apart, the land between them sinks, creating a valley. This geological process can lead to the formation of new landforms, such as mountains and lakes, and is often associated with volcanic activity. Rift valleys can be found in various parts of the world, with the most famous example being the East African Rift. This rift is home to several large lakes, including Lake Victoria and Lake Tanganyika, and is significant for its unique ecosystems and diverse wildlife.