TorTour de Ruhr

#One quadrilateral #Quadrilaterals with dark surfaces or parts of surfaces #Series of letters in different dimensions #Series of letters presenting different forms of writing #Dogs, wolves, foxes #Horizontal lines or bands #Two lines or bands #Quadrilaterals containing other figurative elements #Other geographical maps #Letters in light-coloured characters on a dark background #Thin lines #Numerals presenting a special form of writing #Letters underlined, overlined, framed or barred by one or more strokes #Numerals juxtaposed or joined to a letter or a figurative element #Quadrilaterals containing one or more letters