former coal mine turned into Lake Most in Czechia

In 2008, Czechia began flooding the lignite mine created after the old city of Most was demolished for coal; by 2014 the pit held 70.5 billion litres of water, forming a 309-hectare lake up to 75 metres deep

The flooding started in 2008, and by 2014 the former mine had filled with about 70.5…