Stock Photo: Landscape in the Simien Mountains National Park During the rainy season every day clouds are building up at the edge of the escarpment resulting in heavy thunderstorms The Simien Semien, Saemen, Simen Mountains National Park is part of the UNESCO World. Landscape in the Simien Mountains National Park During the rainy season every day clouds are building up at the edge of the escarpment resulting in heavy thunderstorms The Simien Semien, Saemen, Simen Mountains National Park is part of the UN