Sikkim is the second smallest state after Goa, but it has many physical features like forests, rivers and mountains around its edges. Most of the mountains are above 6100 metres (20000ft) are near the west of the occupied territory, like Mt Kanchendzonga. Other mountains that are over 6100 meters (20000ft)tall are Kabru (the second tallest), Sinilchu, Pandim, Rothong, Kokthang, Talung, Kanglakhang, Simvo & Jonsang. On the east side the tallest peak is Paunhri, which is about 6700 meters(22000ft) tall. The other mountains that are a little bit shorter than 6100 meters (20000ft) are Masthonangye, Yabukjakchen, Narsing and Lamaonden. Most of the mountains in Sikkim have never been climbed, because the Sikkimese consider them sacred. They feel that when the mountains are climbed, they will not be holy anymore.

Sikkim has many hot springs which are known to be good for health. The most important hot-springs are at Phurchachu (Reshi), Yumthang, Borang, Ralang, Taram-chu and Yumey Samdong. All these hotsprings have a lot of sulfur and are near the river banks. The average temperature of the water in these hot springs is 50 °C.