From PathfinderWiki

The desert region of Osirion to the south-east of Sothis is known as the Underdunes, and is one of the country's most impressive physical features. It takes its name from the immense sandy trenches carved by the passage of countless elementals through the desert. The trenches can provide travellers with welcome shade, but there remains the ever-present risk of a sand slide.1


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  1. James Jacobs et al. (2011). The Inner Sea World Guide, p. 148–9. Paizo Publishing, LLC. ISBN 978-1-60125-269-2