Those details of a map, collectively, which do not represent natural features of the area delineated, as names and the symbols for towns, roads, houses, bridges, meridians, and parallels.
Features constructed by man that are under, on, or above the ground which are delineated on a map. These include roads, trails, buildings, canals, sewer systems, and boundary lines. In a broad sense, the term also applies to all names, other identification, and legends on a map.
On USGS maps, "culture" refers to any man-made feature above or below ground, including roads, cities, dams, sewers and radio towers.