unknown mountains on postage stamps
China Liberated Areas 1947, "Manchuria mountains".
Manchuria is the northeastern part of China, known to the Chinese as Dongbei (“the Northeast”). It is a geographical and historical region that consists of Heilongjiang, Jilin and Liaoning provinces and the eastern half of the autonomous region of Nei Monggol (Inner Mongolia).
The stamp was issued in the series "35th Anniv. of Founding of People's Republic of China".
The stamps were issued in the series "Special-use Stamps for Greeting Cards".
China 2015, "Chinese Dream - Happiness of the People".