Hokkaido Nature Trail – In Japan, this trail is about 4,600 km (2,900 mi) long.
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The world's longest trail is actually further north though, in Canada. The Great Trail, formerly known as the Trans Canada Trail, runs for a rather daunting 14,912 miles (or 24,000km) and is currently the longest hiking trail in the world.
The American Discovery Trail is a 6,800-mile route that travels from coast to coast across 15 states and boasts the longest distance of any U.S. trail.