## National_Parks

park_id | name | location
--- | --- | ---
1 | Yellowstone | Wyoming
2 | Grand Canyon | Arizona
3 | Rocky Mountain | Colorado
4 | Everglades | Florida
5 | Great Smoky Mountains | Tennessee

## Trails

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_Parks_Trails

national_park_id | trail_id
--- | ---
(→ National_Parks.park_id) | (→ Trails.trail_id)
1 | 1
2 | 1
3 | 1
4 | 1
5 | 1
5 | 2