by Alf Gillman on Flickr.Deriba Caldera – a 5km diameter volcanic caldera in Western Sudan.

    by Alf Gillman on Flickr.Deriba Caldera - a 5km diameter volcanic caldera in Western Sudan.

    by Alf Gillman on Flickr.Deriba Caldera – a 5km diameter volcanic caldera in Western Sudan.
    #lake, #rift, #soudan, #Afrique, #africa