The territory of Charlestown was initially quite large. From it, Woburn was separated in 1642, Malden in 1649 (including what is now Melrose and Everett) and Stoneham in 1725. South Medford, the land south of the Mystic River (now surrounded by Somerville), was known as "Mistick Field" and was transferred from Charlestown to Medford in 1754. This grant also included the "Charlestown Wood Lots" (the Medford part of the Middlesex Fells), and part of what was at the time Woburn (now Winchester). Other parts of Medford were transferred to Charlestown in 1811. Still-rural Somerville was split off in 1842 as Charlestown was urbanizing. Everett, Burlington, Arlington and Cambridge also acquired areas originally allocated to Charlestown. Landfill operations eliminated the narrow "Charlestown Neck" that connected the northwest end of the "Charlestown Peninsula" to the mainland at Sullivan Square.