SibFU team arranged expedition to Ergaki Natural Park (Krasnoyarsk Territory, Russia) in June 2019 to explore mountain ecosystems. The research activities were committed to investigate the mechanisms of forest line fluctuation in Western Sayan mountains. The data collected shall be used for Mountain Information Block. Ergaki Natural Park area is also a perfect place for MOOC fulfilment as the infrastructure and natural abundance allow to create consistent educational material.