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Distribution of size (km2) and extreme values
| Prefecture | Minimum (km2) | Prefecture | Maximum (km2) |
| Kagawa | 1862 | Akita | 11434 |
| Osaka | 1894 | Nagano | 12374 |
| Tokyo | 2102 | Fukushima | 13783 |
| Toyama | 2132 | Iwate | 15279 |
| Okinawa | 2274 | Hokkaido | 83455 |
| Mean | 7739.149 | SD | 11701 |
| Median | 5761.000 | Variance | 136918475 |
| Mode | Range | 81593 | |
| Interquartile range | 3299 |
