China (mainland) (NB) (P), Japan (NB), Kyrgyzstan (P), Mongolia (P), North Korea (NB) (P), Russia (Asian) (B), Russia (Central Asian), South Korea (NB) (P).
Vagrant to Bangladesh (NB), France, Hong Kong (China) (NB), India (NB), Italy, Kazakhstan, Malta, Myanmar (NB), Nepal (NB), Netherlands Antilles, Pakistan, Spain, Svalbard and Jan Mayen Islands, Taiwan (China) (NB), Thailand (NB), Uzbekistan.
Unknown to Afghanistan.
Population
Estimated population is 500,000 - 700,000 (2010) and decreasing.