My Favorite Slums 17 February 2011, Cervera de los Montes A4 (29,7 x 21,0 cm) Ballpoint pen and felt-tip pen on paper i Slum is an informal urban settlement or a run-down area of a city characterized by substandard housing and squalor and lacking in tenure security. The percentage of urban dwellers living in slums is over 50%. Tags: Slum, house, list 372 / 779