1.it does not have bus from yangshuo to sanjiang .
2.from guilin to sanjiang about 160 km,it will take 5 hours to get there.
if you are going to chengyang village,there are many mini buses available in sangjiang county .
I think it is more like 4 hours to get from Guilin to Sanjiang. From Sanjiang to Chengyang takes 30 minutes. You probably have to change bus stations in Sanjiang.
Yangshuo is only a small town,Chengyang is a small village.It's at least 220km far away each other.That's why there is no direct bus from Yangshuo to Chengyang village.You have to change buses at least three times on the way if you travel to Chengyang begin from Yangshuo.
Detailed transfer routes:
Yangshuo - Guilin 1.5hour and 15rmb/per 65km
Guilin - Sanjiang 4hours and 34rmb/per 155km
Sanjiang - Chengyang 25minutes and 5rmb/per 19km
It's very easy to take the bus from different bus station. I am also going to visit Chengyang wind and rain bridge in the next month with my clients!
Chengyang Bridge is the bridge not the village, the village which you enter after crossing over the bridge is called Ma An.
When you get to Ma An be sure to climb the hill near the bridge with the temples on top and the bridge is lit at night Fabulous view of the area and it took us just over 4 hours to go from Sanjiang to Guilin
the link below will give you and idea of the village and the bridge
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