The remaining territories were joined into the new "County of Kymmenegård and Nyslott". In 1743 following a new conflict southern part of the new county, including the residence city of Villmanstrand, was ceded to Russia in the Treaty of Åbo. Remaining part of the county was merged with some territories from County of Nyland and Tavastehus in 1747 to a new County of Savolax and Kymmenegård.