The Janowa Dolina massacre took place in April 1943 in the village of Janowa Dolina, (now Bazaltove). Janowa Dolina was a model settlement for workers of the Polish State Basalt Quarry, located in the Volhynian Voivodeship, in the Kostopol County of the Second Polish Republic. The name comes from Polish king Jan Kazimierz Waza, who reportedly hunted in the Volhynian forests, and after hunting — rested on the shore of the Horyn river.