noun
national border; border between countries
Rare term; the standard word is 国境 (こっきょう). May appear in older texts or formal contexts.
See also: 国境 (こっきょう)
古い地図には国界が太い線で示されている。
On old maps, national borders are shown with thick lines.
The common, modern word for 'national border'. 国界 is a rare synonym.
Compound of 国 (country) and 界 (boundary). The reading こっかい is a regular on'yomi combination.