The Donbas, Ukraine
The main city in the Donbas region is Donetsk.
Donetsk has a larger Russian population than Ukraine.
The Donbas is littered with slag heaps – the waste product of metal smelting.
Ukraine was part of the Soviet Union from 1922 to 1991.
The city of Donetsk is twinned with Sheffield.
Over 230 billion tonnes of coal exist underneath the Donbas region.