Check out 14 CFR 91.119 [1]. Over sparsely populated areas, there is no specific minimum altitude requirement—only that you need enough altitude to safely land

Check out 14 CFR 91.119 [1]. Over sparsely populated areas, there is no specific minimum altitude requirement—only that you need enough altitude to safely land following engine failure. [1] https://www.ecfr.gov/current/title-14/chapter-I/subchapter-F/part-91/subpart-B/subject-group-ECFRe4c59b5f5506932/section-91.119# https://www.ecfr.gov/current/title-14/chapter-I/subchapter-F...