Ridge number of start structure  Average 18,018 ridges
Worst 1;

Tokyo 58,035
Kanagawa 52,479
Aichi 48,746
Saitama 47,384
Osaka 43,143
Worst 2;

Chiba 40,378
Hokkaido 34,534
Hyogo 33,442
Shizuoka 32,186
Fukuoka 25,408
   Best 1;

Tottori 4,401
Kouchi 4,819
Tokushima 5,578
Saga 5,698
Shimane 5,700
Best 2;

Fukui 6,667
Okinawa 6,976
Wakayama 7,014
Kagawa 7,314
Yamanashi 7,824