Perthshire (/pɛrθʃər/; Scottish Gaelic: Siorrachd Pheairt), officially the County of Perth, is a registration county in central Scotland. It extends from Strathmore in the east, to the Pass of Drumochter in the north, Rannoch Moor and Ben Lui in the west, and Aberfoyle in the south. It was a local government county from 1890 to 1930. Perthshire is known as the "big county" and has a wide variety of landscapes, from the rich agricultural straths in the east, to the high mountains of the southern Highlands.