Fig. 6

Harrat Rahat boundary variations overlain by the city limits of Al-Madinah (red). Thin black lines represent fitted shapes, thick black lines represent boundaries with buffer, North is up. a 1256 AD lava flow extent shown in red, Al-Madinah city boundary shown in blue. b convex hull, c ellipse, d rectangle, e isocontour, f anisocontour