Brunei Darussalam, China (mainland) (NB), Indonesia (NB), Japan (B) (NB), Malaysia, Philippines (NB), Russia (Asian) (B), Singapore, Taiwan (China) (NB).
Vagrant to Hong Kong (China), North Korea, Palau, South Korea (NB).
Breeds on southern Sakhalin, Japan (S, including offshore islands of Rishiri-to, Teuri-jima and Sado, to central Honshu), southern Kuril Is (southern from Iturup), and Askold I (off Vladivostok, in south-eastern Russia). Non-breeding Ryukyu Is, Philippines and northern Borneo.
 
Rarity Status
Currently this species is not classified as a rarity in this country OR information has not been updated.
Population
Estimated population is unknown (2010).