| park_id | name | location |
|---|---|---|
| 1 | Yellowstone | Wyoming |
| 2 | Grand Canyon | Arizona |
| 3 | Rocky Mountain | Colorado |
| 4 | Everglades | Florida |
| 5 | Great Smoky Mountains | Tennessee |
| trail_id | difficulty | length |
|---|---|---|
| 1 | Beginner_Trail | 1.0 |
| 2 | Moderate_Trail | 3.0 |
| 3 | Difficult_Trail | 6.0 |
| 4 | Expert_Trail | 9.0 |
| 5 | Family_Friendly_Trail | 2.0 |
| national_park_id | trail_id |
|---|---|
| (→ National_Parks.park_id) | (→ Trails.trail_id) |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 5 | 2 |