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The Grand Duchy of the Lagoan Isles is a micronation based in Britain. It was created in 2005 by school teacher Louis Robert Harold Stephens ("Grand Duke Louis", born 1985) as a class project, and claims as its territory Baffins Pond, in Portsmouth, along with the three tiny islands located within the pond.

Baffins is an administrative district of Portsmouth, England, located on the eastern side of Portsea Island. The district is mainly composed of 1930s housing. The population of the Portsmouth ward at the 2011 Census was 15,121.Before the area became developed for housing, it had been occupied by a farm of the same name.