Brunei Darussalam, Cambodia, China (mainland), Hong Kong (China), Indonesia, Japan, Laos, Malaysia, Myanmar, North Korea (B), Philippines, Russia (Asian), Singapore, South Korea, Taiwan (China), Thailand, Timor-Leste (NB) (P), Vietnam.
Vagrant to Mongolia.
North-eastern China to Amurland and Ussuriland, Japan and Izu Is. Winters from southern and south-eastern China and Taiwan through Indochina and Malay Peninsula to Greater Sundas, Philippines, Sulawesi and islands off north-western New Guinea.
 
Rarity Status
Currently this species is not classified as a rarity in this country OR information has not been updated.
Population
Estimated population is 100,000 (2010).