Not just Forest Service lands (which have a nice online map[1] to find your nearest) but also Bureau of Land Management land as well, depending on where you are

Not just Forest Service lands (which have a nice online map[1] to find your nearest) but also Bureau of Land Management land as well, depending on where you are[2] (mainly the Western US). 1: https://www.fs.usda.gov/ivm/ https://www.fs.usda.gov/ivm/ 2: https://webmaps.blm.gov/program_apps/BLM_Natl_Recreation_Opportunities/ https://webmaps.blm.gov/program_apps/BLM_Natl_Recreation_Opp...