Xiousing (pronounced yow-sing) is a small Shou district on the northern edge of Marsember, built on land revealed when the Sea of Fallen Stars receded during the Spellplague. It was settled by Shou immigrants who sailed across the Sea of Fallen Stars and is currently governed by the venerable Duc-Sum Li.

The district is a dense cluster of buildings along narrow streets cramped with vendor stalls, surrounding fields of rice and soy. Its architecture features traditional Shou styles. At night, the streets are illuminated by rice-paper lanterns strung along the bridges that still span the drained canals. Rickshaws serve the district, as well as other locations throughout Marsember.