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Gradient

Flat ≤2%
Gentle 2–5%
Rolling 5–8%
Steep 8–12%
Very steep >12%
▶Arrows ≈ — apart
Terrain: Mapzen, SRTM, USGS, NOAA (Open Data)  ·  Basemap: Esri, Thunderforest, OpenStreetMap contributors  ·  Rendered with MapLibre GL JS