Black Lands, lands in the heart of Russia, extending between the Carpathians and the Urals, constituting one-third of the soil, and consisting of a layer of black earth or vegetable mould, of from 3 to 20 ft. in thickness, and a chief source, from its exhaustless fertility, of the wealth of the country.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Black Hole of Calcutta * Black Monday