Afghanistan (P), Azerbaijan (P), China (mainland) (NB) (P), India (NB), Iran [Islamic Republic of] (NB), Kazakhstan (P), Mongolia (NB) (P), Pakistan (P), Russia (Asian) (B), Russia (Central Asian) (B), Russia (European) (B), South Korea (NB), Turkmenistan (P).
Vagrant to Hong Kong (China), Japan (NB) (P), Uzbekistan.
Arctic western and east-central Siberia; possibly also extreme north-western Russia. Three wintering areas: middle R Yangtze in China; Keoladeo (Bharatpur) and other wetlands in India; and southern Caspian Sea in Iran.
 
Population
Estimated population is 3,750 (2010) and decreasing.