Badus, Mountain summit in Grisons and Uri, Switzerland

Badus, also called Six Madun, is a 2,928-metre summit of the Gotthard Group on the watershed between the Vorderrhein and the Reuss, on the border of Graubünden and Uri. Its western side drops over 1,000 metres to the Unteralp valley, while the Tomasee lies on its northeastern slope. The peak is the local mountain of the municipality of Tujetsch.

The first recorded ascent was made in August 1785 by the monks Placidus a Spescha and Fintan Birchler, though only Placidus a Spescha reached the summit. He was an active alpinist who had already made many first ascents in the Surselva. The summit at 2,928 m carries the cantonal border between Graubünden and Uri and lies on the watershed between the Vorderrhein and the Reuss.

The name Badus is the Romansh adjective badus, "steep", from the verb badar, "to lean, to watch". Six Madun mixes six, a Franco-Provençal word for rock brought by cartographers from Valais, with Madun, from sursilvan meida, "large haystack". The Tujetsch Romansh form is Piz Badus.

The best time to reach the summit is during summer months from June to September, when experienced hikers can follow marked trails starting from Oberalp Pass. The route requires hiking experience and good fitness due to the steep terrain.

The name Badus comes from the Romansh adjective badus, meaning steep, derived from badar, to lean or observe. The second name, Six Madun, mixes a Franco-Provençal six for rock, brought in by cartographers, with Madun from the Sursilvan meida, a large haystack. The summit was first climbed in August 1785 by the monks Placidus a Spescha and Fintan Birchler, but only Placidus reached the top.