In "South" Korea, Nakdong River is the longest with 525 km -
around 326 miles. The longest in Korean Peninsular including North
Korea, it is Aprok River - bordering North Korea and China, 790 km
- around 491 miles.
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South Korea can be divided into four general regions: an eastern
region of high mountain ranges and narrow coastal plains; a western
region of broad coastal plains, river basins, and rolling hills; a
southwestern region of mountains and valleys; and a southeastern
region dominated by the broad basin of the Nakdong River.