nine bends thirteen curves, which means the way is really curvy
Definitions (粵典–words.hk)
語句
形容道路彎曲 the road or route is very complicated
條山路九曲十三彎,行得好辛苦呀。
条山路九曲十三弯,行得好辛苦呀。
tiu4 saan1 lou6 gau2 kuk1 sap6 saam1 waan1, haang4 dak1 hou2 san1 fu2 aa3. The road is very complicated, walking on it is very tiring.
Definitions (Wiktionary)
phrase, Cantonese, idiomatic
tortuous; full of bends (syn.) 九曲十八彎, 九曲十八弯