The county of Kent lies on the southeastern tip of Great Britian. It is bordered to the north by what is considered Greater London and to the south by the English Channel. Due to its location, in such close proximity to the European continent, it has has been subject to many invasions by the Romans, Jutes, Saxons, and Normans. Evidence of Romans architecture has been unearthed in modern day Canterbury, a town within Kent. In the 19th century, rapid industrialism led to the growth of London and the suberbs of London, increasingly encroaching on surrounding counties and towns. In Bleak House by Charles Dickens, he uses the image of fog to show this rapid spread. Dickens writes, "Fog up the river, where it flows among green aits and meadows; fog down the river, where it rolls defiled among the tiers of shipping and the waterside pollutions of a great (and dirty) city. Fog on the Essex marshes, fog on the Kentish heights" (Dickens Ch. 1). The fog spreads from the "great city" (London) outwardly to the more distant locations of Kent and Essex. An image of a church in Canturbury, within Kent, is linked here.
Source: https://www.britannica.com/place/Kent-county-England