A fictional city from Leigh Bardugo's Grishaverse. It is based off of Amsterdam but is superior in many ways as it is home to the Dregs, lead by Kaz Brekker who is one of the best morally grey protagonists written, ever. It unfortunately also home to Pekka Rollins and Van Eck, both dispicable criminals of the evil, not-Kaz-Brekker sort.
Person 1: "I want to live in Ketterdam"
Non-Reader: "What's that?"
Person 1:" A place of gambling, law-breaking, canals, stunning buildings, the Crow Club..." (they continue their description whilst the non-reader walks off in confused silence)