《汉书·志·地理志上》
柴县，盖县，洙水从临乐的子山流出，向西：盖县流入池水。
柴，盖，临乐子山，洙水所出，西北至盖入池水。
Chaixian and Gaixian, where the Su River flows from Zishan in Linyue, flows westward to Gaixian and enters the Chi River.
<s>[INST] Kindly elucidate the central themes in this passage in English: 柴，盖，临乐子山，洙水所出，西北至盖入池水。 [/INST] Chaixian and Gaixian, where the Su River flows from Zishan in Linyue, flows westward to Gaixian and enters the Chi River.</s>
Kindly elucidate the central themes in this passage in English: 柴，盖，临乐子山，洙水所出，西北至盖入池水。
user
Chaixian and Gaixian, where the Su River flows from Zishan in Linyue, flows westward to Gaixian and enters the Chi River.
assistant