《徐霞客游记·滇游日记二十九》
那岔道就从山脊上分开，从山脊西边近处的峡谷中往南下走，峡中居民房屋非常多，这里是旧炉塘。
其岐即从脊间分，脊西近峡南下，其中居庐甚殷，是为旧炉塘。
The fork leaves from the ridge and goes southward down from the gorge near the western side of the ridge; there are many houses in the gorge, and this is the old Luotang.
<s>[INST] Kindly elucidate the central themes in this passage in English: 其岐即从脊间分，脊西近峡南下，其中居庐甚殷，是为旧炉塘。 [/INST] The fork leaves from the ridge and goes southward down from the gorge near the western side of the ridge; there are many houses in the gorge, and this is the old Luotang.</s>
Kindly elucidate the central themes in this passage in English: 其岐即从脊间分，脊西近峡南下，其中居庐甚殷，是为旧炉塘。
user
The fork leaves from the ridge and goes southward down from the gorge near the western side of the ridge; there are many houses in the gorge, and this is the old Luotang.
assistant