《徐霞客游记·粤西游日记三十六》
它延伸来的山脉应当起自南丹州分出支脉南下，盘结为此山；往东延伸到青塘的南面，山脊延伸过之处成为石壁堡山；又向东延伸环绕在柳江的南面，成为穿山骚诸处的群山；而后向东在武宣县的西南境到了头，在柳江、都泥江两江相会处之间。
其来脉当自南丹分枝南下，结为此山；东行至青塘之南，过脊为石壁堡山；又东走而环于柳江之南，为穿山驿诸山；而东尽于象州之西南境，柳、都二江交会之间。
Its mountains extend from the branches in Nandan Prefecture to the south, intertwined to form this mountain; extended to the south of Qingtang in the east, becoming the Shitangbao mountain range; and extended once again to the south of Liujiang river in the west, becoming the mountain ranges of Chushan district; then reaching the most eastern bound in Wuxuan prefecture in the southwest, between the juncture of Liujiang and Dunei River.
<s>[INST] Kindly elucidate the central themes in this passage in English: 其来脉当自南丹分枝南下，结为此山；东行至青塘之南，过脊为石壁堡山；又东走而环于柳江之南，为穿山驿诸山；而东尽于象州之西南境，柳、都二江交会之间。 [/INST] Its mountains extend from the branches in Nandan Prefecture to the south, intertwined to form this mountain; extended to the south of Qingtang in the east, becoming the Shitangbao mountain range; and extended once again to the south of Liujiang river in the west, becoming the mountain ranges of Chushan district; then reaching the most eastern bound in Wuxuan prefecture in the southwest, between the juncture of Liujiang and Dunei River.</s>
Kindly elucidate the central themes in this passage in English: 其来脉当自南丹分枝南下，结为此山；东行至青塘之南，过脊为石壁堡山；又东走而环于柳江之南，为穿山驿诸山；而东尽于象州之西南境，柳、都二江交会之间。
user
Its mountains extend from the branches in Nandan Prefecture to the south, intertwined to form this mountain; extended to the south of Qingtang in the east, becoming the Shitangbao mountain range; and extended once again to the south of Liujiang river in the west, becoming the mountain ranges of Chushan district; then reaching the most eastern bound in Wuxuan prefecture in the southwest, between the juncture of Liujiang and Dunei River.
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