Range
Breeding in eastern mainland China, as well as on the west coast of Korea, Saunder’s gull winters in eastern and southern China, Hong Kong, Macau, Taiwan, western and southern South Korea, southwestern Japan, and Vietnam. Non-breeders are found in North Korea (2).
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View a distribution map for this species at UNEP World Conservation Monitoring Centre.
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Habitat
It inhabits saltmarshes during the breeding season, nesting on the ground. During the winter it forages on estuarine tidal flats as well as drained aquaculture ponds nearby (2). It is mainly seen on coastlines, but some populations are found around inland wetlands (4).