Claremont Square is a quiet Georgian square in the Islington district of London. Its central green mound hides an old reservoir built between 1821 and 1828 and now part of the Thames Water Ring Main. The square is lined with early‑19th‑century terraced houses of yellow brick and cast‑iron balconies, with the south side facing Pentonville Road. Mature trees and iron railings enclose the central mound, giving the area a secluded feel despite its proximity to busy King’s Cross.