Watchmaker's Hill
"What can you find at Watchmaker's Hill? A sinister fungal wilderness by the river. The Department of Menace Eradication subcontracts the adventurous to deal with the things that slither out of Bugsby's Marshes. An observatory atop the hill employs only blind men."

Watchmaker's Hill is a district in southeastern London, on the south side of the Stolen River and just beyond Bugsby's Marshes. As befitting a district on the hinterlands of the city, Watchmaker's Hill is one of the more dangerous places in London. The Department of Menace Eradication has its main office just riverside of the Hill itself. Many visitors to the district also patronize the Medusa's Head tavern, owned by a gentleman by the moniker of the Cheery Man.
Visitors from the Surface should be advised never to call the district “Greenwich”. The Masters would be displeased.