It is widely inhabited in Asia and during summer it breeds in the northeastern part of the People's Republic of China, Japan, Russia's southeastern part, the Korean Peninsula.
In the winter, it winters over south of the People's Republic of China and south to Southeast Asia
In Japan, as a summer bird, It migrates to the north of central Honshu, Hokkaido for breeding.
(Cited from the Japanese sentence of the Wikipedia)
(Cited from the Japanese sentence of the Wikipedia)