Postern Mountain is a 2,944-metre (9,659 ft) mountain located on the SE side of Mount Robson Provincial Park in the Canadian Rockies, British Columbia, Canada.

[3] It is a part of the Ramparts range and is adjacent to Geikie Creek, a small stream connected to the Fraser River.

[5] It is notable for its steep cliff faces and abundance of quartzite, unusual for the majority-limestone mountains that surround it.

These factors make it, along with the rest of the Ramparts, an attractive destination for mountain climbers.

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