The upper parts of Carneddi, Cilfodan and Tan y Foel owe more to stone quarrying on the nearby hills rather than slate quarrying that supported the lower end of the town. At the eastern limits, the town is bounded by the rising land of the Carneddau mountains which form some of the more remote landscapes of Snowdonia. Much of Bethesda once consisted of discrete villages such as Gerlan, Rachub, Tregarth, Llanllechid and Braichmelyn; their names are retained as districts of the town.