gravel path; gravel road
Refers to a path, road, or lane surfaced with gravel. Common in rural or park settings.
If you go straight along this gravel path, you'll reach the shrine.
Be careful on rainy days because the gravel road gets muddy.
未舗装道路 is a general term for unpaved roads; 砂利道 specifically has a gravel surface.
Compound of 砂利 (じゃり, 'gravel') and 道 (みち, 'road, path').