L-31n is a hiking, biking, and horse trail in Miami-Dade County, Florida. It is within Everglades National Park. It is 21.0 miles long and begins at 8 feet altitude. Traveling the entire trail is 41.9 miles with a total elevation gain of 13 feet. The S-331, S-332B, and S-332C pumps and the S-173 culvert can be seen along the trail. The trail ends near the S-332D pump, L-31N and another dike, and the S-174 spillway.
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