Mountains cover about a quarter of the world’s land surface and provide water and mineral resources, timber and non-timber forest products, and many other food, fiber and fuel products. This Collection will provide a platform for interdisciplinary studies of mountain surface processes and their responses to climate change and human activities. Submissions are welcome in areas such as mountain ecology and environment change, degradation and restoration of mountain ecosystems, mountain plants and vegetation, dynamics of debris flows, landslides and soil erosion in mountain areas, and watershed management and development.