An octagonal two-storey pavilion with grey tiled roofs crowns a stone gate tower reached by a ramp, beside a small house and wooden landing stages on the water, under an old pine. Suyunyan, one of the fortified gate towers of the Summer Palace, guards the western end of Longevity Hill and was dedicated to Guan Yu, god of war, as a counterpart to the Wenchang Pavilion in the east.