Introduction -- Distribution of basaltic tuff landforms -- Definition of terms -- Maar -- Dry maar or ubehebe -- Tuff cone or tuff ring -- Diatreme -- Maar or tuff ring field identification -- General types -- Simple maars - Simple maars modified by later lava -- Complex maars -- Surface expression -- Thickness of the layered tuffs -- Composition and structure of the tuffs -- Microscopic character -- Volcanic processes in maar formation -- Conclusions -- References