by Alf Gillman on Flickr.Deriba Caldera – a 5km diameter volcanic caldera in Western Sudan. January 31, 2021 by maryburtons tagged africa, Afrique, lake, rift, soudan by Alf Gillman on Flickr.Deriba Caldera – a 5km diameter volcanic caldera in Western Sudan. Share this:TwitterFacebookLike this:Like Loading... Related