The Humska Zemlja, also Hum (Serbo-Croatian: Humska Zemlja, or Hum; Хумска Землја or Хум), is a historical zemlja that arose in the Middle Ages as well-defined administrative unit of medieval Bosnia ruled by the Kosača dynasty. It included most of today's Herzegovina, in Bosansko Primorje including Konavle, territories on the south of Dalmatia between Omiš and Neretva Delta, in Boka Kotorska and south to Budva. The name for this zemlja derived from the earlier name for the region, Zahumlje. The seat of Kosače family was in the town and fortress of Blagaj and during the winter seasons, Novi.