Extended Data Fig. 7: Representativeness according to elevation.
From: National assessment of river protection in the United States
Percentage of river length protected according to different classes of the Protected River Index (PRI) within elevation classes (colored sectors; right) and total river length (white sectors; left) across elevation classes. Lowlands < 200 m; Hills = 200-500 m; Mid-altitude = 500-1,000 m; High mountains = 1,000-2,000 m; Very high mountains ≥ 2,000 m.
