 Even though the territory ceded to Poland was roughly as large as the territory transferred to the Soviet Union, the land around Ustrzyki Dolne lacked industry, natural resources and fertile soil.On top of that, it was already depopulated during the 1947 Polish-Soviet Operation Vistula.In 1968–69 the Polish government of Władysław Gomułka completed the hydro-electric Solina Dam, long, and high, on the San river, which created Lake Solina.