liǎng / zuò / chéng / shì / yǐ / hé / liú / wéi / jiè / bìng / zài / àn / biān / lì / le / yí / kuài / jiè / shí

两座城市以河流为界，并在岸边立了一块界石。

The two cities used the river as their boundary and erected a boundary stone on the bank.