Kremenchuk is an important industrial city in central Ukraine. It is set on a large layer of a mineral called chert, for which it is named; its location at the southern terminus of the navigable portion of the Dnieper is advantageous, and it has been a wealthy Cossack town since 1625. The city suffered terribly under Nazi occupation and was largely destroyed, but it was liberated in 1943 and has been rebuilt in a modern, well-planned style.