South Korea's foreign exchange reserves climbed to a record high in December on the back of the weakening of the US greenback, which pushed up the dollar value of other foreign currencies held by the country, central bank data showed Monday.

The country's foreign exchange reserves came to $408.82 billion as of the end of last month, up $1.36 billion from a month earlier, according to the data from the Bank of Korea.

The amount marks the world's ninth largest.

The increase "mainly stems from an increase in the dollar value of assets in other foreign currencies due to the weakening of the US dollar," the BOK said, without providing detailed composition of assets held in each currency.

Foreign exchange reserves consist of foreign securities, special drawing rights, gold bullion and the International Monetary Fund reserve position.

As of end-December, South Korea held some $385 billion worth of foreign securities, including bonds, up $8.51 billion from a month earlier, according to the BOK.

But foreign currency savings plunged $7.31 billion to $12.5 billion over the cited period, while the country's reserve position at the IMF gained $170 million to $2.79 billion.

Its special drawing rights and gold holdings remained nearly flat at $3.35 billion and $4.79 billion, respectively, according to the central bank. (Yonhap)