Bern lies on the Swiss plateau in the Canton of Bern, slightly west of the centre of Switzerland and 20 km (12 mi) north of the Bernese Alps. The countryside around Bern was formed by glaciers during the most recent Ice Age. The two mountains closest to Bern are Gurten with a height of 864 m (2,835 ft) and Bantiger with a height of 947 m (3,107 ft). The site of the old observatory in Bern is the point of origin of the CH1903 coordinate system at 46°57′08.66″N 7°26′22.50″E﻿ / ﻿46.9524056°N 7.4395833°E﻿ / 46.9524056; 7.4395833.