long-distance nature trail
Refers to designated long-distance walking paths through natural areas, often maintained by local governments or national parks.
This long-distance nature trail runs through the mountains all the way to the coast.
A promenade or walking path, often shorter and more urban or park-like, while 長距離自然歩道 emphasizes long-distance and natural settings.
Compound of 長距離 (long-distance), 自然 (nature), and 歩道 (walking path).