The data is the provincial capital level city of Songliao basin.
Songliao basin generally refers to the northeast of China.
The administrative divisions include Liaoning, Jilin, Heilongjiang provinces,
four League (cities) in Eastern the Inner Mongolia Autonomous Region,
and the part of Chengde City in Hebei province.
The provincial capital level of cities of Songliao basin are including
Changchun city and Ha'erbin city.
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