Spa Fields is a park and its surrounding area in the London Borough of Islington, bordering Finsbury and Clerkenwell. Historically it is known for the Spa Fields riots of 1816 and an Owenite community which existed there between 1821 and 1824. The park, or open common, was once of 14 hectares but was mostly built over in the 19th century, beginning in the 1830s, and is now a small park, popular with office workers at lunchtime, and as a children's playground.