A total of 12.1 million people is threatened with sediment-related disasters in Japan.
| Prefecture | Number of mountain streams at risk of debris flow | Places at risk of landslide | Places at risk of steep slope failure | Places at risk of avalanche |
|---|---|---|---|---|
| Hokkaido | 1,607 | 437 | 3,158 | 1,151 |
| Aomori | 645 | 63 | 1,318 | 892 |
| Iwate | 2,204 | 191 | 1,792 | 333 |
| Miyagi | 1,359 | 105 | 1,841 | 110 |
| Akita | 1,692 | 262 | 1,318 | 1,052 |
| Yamagata | 1,268 | 230 | 585 | 839 |
| Fukushima | 1,678 | 143 | 1,435 | 200 |
| Ibaraki | 537 | 105 | 1,105 | – |
| Tochigi | 1,043 | 96 | 887 | 142 |
| Gunma | 1,863 | 213 | 1,667 | 464 |
| Saitama | 585 | 110 | 825 | – |
| Chiba | 212 | 52 | 1,613 | – |
| Tokyo | 391 | 26 | 2,046 | – |
| Kanagawa | 705 | 37 | 2,511 | – |
| Niigata | 2,544 | 860 | 1,975 | 1,421 |
| Yamanashi | 1,653 | 104 | 1,412 | 56 |
| Nagano | 4,043 | 1,241 | 3,205 | 910 |
| Toyama | 556 | 194 | 1,004 | 712 |
| Ishikawa | 1,030 | 420 | 1,177 | 1,285 |
| Gifu | 2,934 | 88 | 2,957 | 847 |
| Shizuoka | 2,311 | 183 | 3,749 | 40 |
| Aichi | 1,555 | 75 | 2,910 | – |
| Mie | 2,693 | 85 | 4,090 | – |
| Fukui | 2,080 | 146 | 1,588 | 849 |
| Shiga | 1,421 | 62 | 1,317 | 299 |
| Prefecture | Number of mountain streams at risk of debris flow | Places at risk of landslide | Places at risk of steep slope failure | Places at risk of avalanche |
|---|---|---|---|---|
| Kyoto | 2,328 | 58 | 1,637 | 687 |
| Osaka | 1,009 | 145 | 896 | – |
| Hyogo | 4,310 | 286 | 5,557 | 826 |
| Nara | 1,136 | 106 | 1,289 | – |
| Wakayama | 2,526 | 495 | 3,144 | – |
| Tottori | 1,626 | 94 | 1,530 | 1,121 |
| Shimane | 3,041 | 264 | 2,874 | 516 |
| Okayama | 3,019 | 198 | 2,475 | 256 |
| Hiroshima | 5,607 | 80 | 6,410 | 234 |
| Yamaguchi | 2,655 | 285 | 3,865 | – |
| Tokushima | 1,129 | 591 | 2,097 | – |
| Kagawa | 1,592 | 117 | 929 | – |
| Ehime | 3,540 | 506 | 2,750 | – |
| Kochi | 1,939 | 176 | 4,175 | – |
| Fukuoka | 2,508 | 215 | 3,566 | – |
| Saga | 1,760 | 200 | 1,759 | – |
| Nagasaki | 2,785 | 1,169 | 5,121 | – |
| Kumamoto | 2,120 | 107 | 3,552 | – |
| Oita | 2,543 | 222 | 4,927 | – |
| Miyazaki | 1,413 | 273 | 2,823 | – |
| Kagoshima | 2,160 | 85 | 4,231 | – |
| Okinawa | 163 | 88 | 465 | – |
| Total | 89,518 | 11,288 | 113,557 | 15,242 |
The above figures for debris flow and slope failures, avalanche, and landslide are published in fiscal 2003, 1997, and 1998 respectively.
| Total population in the threatened area preserved | Population in the mountain streams at risk of debris flow | Population in the places at risk of landslide | Population in the places at risk of steep slope failure | Population in the places at risk of avalanche |
|---|---|---|---|---|
| About 12.1 million people | About 4.3 million people | About 1.6 million people | About 6.2 million people | Population in the places at risk of avalanche |