The Hangang is approximately
497km-long with its basin measuring at 26,219 square kilometers. Its
watercourses cover extensive regions of the middle part of country, including
Gangwon-do, Chungcheongbuk-do, and Gyeonggi-do provinces.
According to the Korean National Geographical
Association, the fountainhead of the Hangang is located on the northern valley
on Geumdaesan(Mt.) in Gangwon-do. Tributaries of the river include 62 streams,
which are under the direct control of the central government, 55 regional
streams managed by each local government, and 3,847 others. The total length of
the tributaries reaches 7,430km.
Since the ancient Three Kingdoms Era on the Korean peninsula , the Hangang has
been holding a geopolitical importance. Since Taejo, Yi Seong-gye, the founder
of the Joseon Dynasty (1392-1910), designated Hanyang (today's Seoul), through
which the Hangang ran, as the nation's capital 600 years ago, Seoul has been
playing political, economic, and cultural centers of Korea.