The ratio of South Korea's short-term foreign debt to its foreign reserves hit the highest level in more than a year in the second quarter, central bank data showed Thursday.

The country's short-term external debt -- with a maturity of one year or less -- totaled $117.3 billion as of the end of June, up $1.9 billion from three months earlier, according to the data by the Bank of Korea.

The end-June figure accounted for 28.8 percent of the country's total external debt, the highest percentage since the third quarter of 2014, when the comparable figure was 29.1 percent, the latest data showed.

The nation's total external liability reached $407.3 billion at the end of June, also up $1.7 billion from three months earlier.

The ratio of short-term foreign debt to its foreign reserves stood at 30.8 percent at the end of June, marking the highest since the third quarter of 2015, when the comparable figure was 31.3 percent.

South Korea's short-term foreign debt, which refers to external debt with a maturity of less than one year, was an area of concern during past financial turmoil as a sharp rise in foreign debt left lenders vulnerable to external shocks.

The ratio had sharply surged during the global financial crisis, hitting 79.3 percent in the third quarter of 2008.

Meanwhile, South Korea's assets invested overseas reached $1.3394 trillion at the end of June, up $34.9 billion from three months earlier.

Foreign investors' investment in the country, including stocks and bonds, rose $47.3 billion to $1.1153 trillion over the cited period, according to the data. (Yonhap)