The city of Dunwich is a small, almost unnoticeable hamlet that lies within the Dunwich Region. This hamlet is the birthplace of Wilbur Whateley, and his brother, the Son of Yog-Sothoth. The region around Dunwich is described as such:

A lonely and curious country, broken up with ravines of problematical depth and stretches of marshland that one instinctively dislikes. There is dense natural growth and abundant wildlife such as whippoorwills, fireflies and bullfrogs, though the planted fields appear singularly few and barren. The sparsely scattered houses wear a surprisingly uniform aspect of age, squalor, and dilapidation, while the gnarled, solitary inhabitants are silent and furtive.

The hamlet of Dunwich itself is described as such:

Across a covered bridge one sees a small village huddled between the stream and the vertical slope of Round Mountain, and wonders at the cluster of rotting gambrel roofs bespeaking an earlier architectural period than that of the neighbouring region. It is not reassuring to see, on a closer glance, that most of the houses are deserted and falling to ruin, and that the broken-steepled church now harbours the one slovenly mercantile establishment of the hamlet. One dreads to trust the tenebrous tunnel of the bridge, yet there is no way to avoid it. Once across, it is hard to prevent the impression of a faint, malign odour about the village street, as of the massed mould and decay of centuries. It is always a relief to get clear of the place, and to follow the narrow road around the base of the hills and across the level country beyond till it rejoins the Aylesbury pike. Afterward one sometimes learns that one has been through Dunwich.