Zaporizhian Sich was a historical territory that existed between the 16th and 18th centuries. The center of which was located in the region around today's Kakhovka Reservoir. The region stretches across the lower Dnieper river. At one point the area was a condominium of both the Polish-Lithuanian Commonwealth and the Russian Empire. Soon after the colonization of Sich by the Russian Empire with South Slavs and Moldavians, the Sich was liquidated. With the liquidation the area became part of the Novorossia.
The Zaporizhian Sich was a socio-political, grassroots organization of Ukrainian Cossacks placed beyond the Dnieper rapid. It is considered that they started from a fortress built on the Khortytsia island in the middle of the Dnieper River in what is now the Zaporizhia region of Ukraine. The term has also been metonymically used as an informal reference to the whole military-administrative organisation of the Zaporizhian Cossack Host.
Thank you Barsal for this pretty card with an important piece of Ukranian history attached to it.