Foreign currency reserves reached 414.12 billion U.S. dollars at the end of September, down 4.18 billion dollars from a month earlier, according to the Bank of Korea (BOK).
The strong dollar reduced the conversion value of non-dollar assets. The dollar index, which gauges the dollar value versus six major peers, advanced 3.0 percent last month.
The authorities used the foreign reserves to lower the foreign exchange market volatility, contributing to the falling reserves.
South Korea was the world's ninth-largest holder of foreign reserves at the end of August, down one notch from a month earlier.
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