The stamp is part of set of four issued in
1957 to publicize the Yellow River control project. It shows a map of
the basin of the Huang Ho, the
Yellow River. The map is oriented with north at the top. There are
four circles with symbols, from left to right: 1. symbol of an
electric power line, 2. irrigation, 3. power line, 4. shipping.
The Yellow River is China’s the sixth largest river in
the world and the second largest river in China. It rises from
Morinda Yen Kara, the Green
Mountain Range, and flows through Qinghai, Sichuan, Gansu, Ningxia,
Inner Mongolia, Sasnxi, Henan, Shandong and other provinces for 5,464
km, and empties into the Yellow Sea. It drains an area of 750,000 km2.