Northern Bulgaria (, Severna Balgariya), also called Moesia (, Misiya) is the northern half of the territory of Bulgaria, located to the north of the main ridge of the Balkan Mountains which conventionally separates the country into a northern and a southern part. Besides the Balkan Mountains, Northern Bulgaria borders the Timok River and Serbia to the west, the Danube River and Romania to the north and the Bulgarian Black Sea Coast to the east.