| Acreages of Landslide classes within all Inventoried Roadless Areas, stratified by Bailey's Eco-divisions | |||||||||
| All acreage figures are rounded to the nearest 1,000. | |||||||||
| Landslide data were only available for the Lower 48 states, therefore IRA acreages in Alaska and Puerto Rico are not included in this table. | |||||||||
| DOMAIN | DIVISION | LOW INC/ LOW SUS | LOW INC/ MOD SUS | LOW INC/ HIGH SUS | MOD INC/ MOD SUS | MOD INC/ HIGH SUS | HIGH INC/ HIGH SUS | SUM | |
| Polar Domain | Tundra | ||||||||
| Tundra Regime Mountain | |||||||||
| Subarctic | |||||||||
| Subarctic Regime Mountains | |||||||||
| Humid Temperate Domain | Warm Continental | 160 | 8 | 4 | 172 | ||||
| Warm Continental Regime Mountains | 102 | 18 | 145 | 265 | |||||
| Hot Continental | 38 | 8 | 8 | 55 | |||||
| Hot Continental Regime Mountains | 102 | 137 | 29 | 324 | 375 | 967 | |||
| Subtropical | 89 | 9 | 99 | ||||||
| Subtropical Regime Mountains | 4 | 32 | 36 | ||||||
| Marine | 64 | 9 | 73 | ||||||
| Marine Regime Mountains | 1,864 | 6 | 349 | 50 | 2,269 | ||||
| Prairie | 32 | 32 | |||||||
| Mediterranean | 10 | 100 | 12 | 121 | |||||
| Mediterranean Regime Mountains | 2,148 | 30 | 874 | 405 | 494 | 3,952 | |||
| Dry Domain | Tropical/ Subtropical Steppe | 532 | 1 | 2 | 535 | ||||
| Tropical/ Subtropical Steppe Regime Mountains | 972 | 6 | 13 | 14 | 1,005 | ||||
| Tropical/ Subtropical Desert | 1,004 | 1,004 | |||||||
| Temperate Steppe | 366 | 285 | 56 | 7 | 5 | 718 | |||
| Temperate Steppe Regime Mountains | 16,045 | 1,411 | 1,093 | 4,728 | 604 | 1,499 | 25,380 | ||
| Temperate Desert | 2,782 | 250 | 211 | 280 | 44 | 184 | 3,752 | ||
| Temperate Desert Regime Mountains | 2,766 | 131 | 211 | 13 | 231 | 3,352 | |||
| Humid Tropical Domain | Savanna | ||||||||
| Rainforest | |||||||||
| Rainforest Regime Mountains | |||||||||
| 29,078 | 2,290 | 1,427 | 6,559 | 1,412 | 3,021 | 43,788 | |||
| LOW INC/ LOW SUS - Low Incidence / Low Susceptibility | |||||||||
| LOW INC/ MOD SUS - Low Incidence / Moderate Susceptibility | |||||||||
| LOW INC/ HIGH SUS - Low Incidence / High Susceptibility | |||||||||
| MOD INC/ MOD SUS - Moderate Incidence / Less than or equal to Moderate Susceptibility | |||||||||
| MOD INC/ HIGH SUS - Moderate Incidence / High Susceptibility | |||||||||
| HIGH INC/ HIGH SUS - High Incidence / Less than or equal to High Susceptibility | |||||||||