《汉书·志·地理志上》
稗县，夜头水向南流到大海。
椑，夜头水南至海。
Bai county, the Yetou River flows south to enter the sea.
<s>[INST] Kindly elucidate the central themes in this passage in English: 椑，夜头水南至海。 [/INST] Bai county, the Yetou River flows south to enter the sea.</s>
Kindly elucidate the central themes in this passage in English: 椑，夜头水南至海。
user
Bai county, the Yetou River flows south to enter the sea.
assistant