楚河漢界

1. • lit. the river that divides Chu and Han
2. • fig. a line that divides rival territories
3. • the mid-line between sides on a Chinese chessboard

Character by character

• 楚(chǔ)surname Chu
• 河(hé)river
• 漢(hàn)Han ethnic group
• 界(jiè)boundary