Novels are the main source but poetry and non-literary texts are acceptable as well. A simple mention of topographical names is not enough. The description needs to contain elements which can evoke for the reader a mood produced by the physical surroundings. Also the opposite is possible, the impact of the mind on the surroundings. Certain thoughts can shake buildings on their foundations.
Looks can cleave cloudy skies or bring a laugh to chilly streets.
The mind's influence on the world around has no limits. The whole literary repertoire relating to a particular city or to a number of cities is eligible for consideration. Passages to be chosen should be as short as possible. Demarcation lines between prose and poetry fade. Loose passages taken from a multiplicity of books and other writings become interrelated and form new frameworks.