Hey Jody, I used a variety of sources. If you’re talking about the rail trails, the Rails to Trails Conservancy has a website https://www.traillink.com/ that lists them, with reviews. It’s pretty much all there.

The gravel riding info. came from a variety of sources:

-Places where there are organized gravel rides are likely to be good, so I check out where events are. Here’s a calendar of them: Events Archive -
That’s how I found Francis Marion National Forest in SC, which hosts a ride called the Swamp Fox. You can even download maps of those rides from Ride with GPS.

- I Google my brains out - looking at Google Maps, locating forests, wildlife and wilderness areas, etc and checking out networks of roads in them. It also helps sometimes to look at them on Google Earth. I Google the places I find to see if there’s any info posted by local riders - and check Ride with GPS to see if anyone’s posted any rides there.

- I check with local bike shops. One in Ocala turned me on to the great gravel riding at Withlacoochee State Forest.

Hope that helps!