Queenborough-in-Sheppey, town (1991 pop. 33,362), on the Isle of Sheppey, Kent, SE England, at the confluence of the Medway and Thames rivers. Radios, furniture, glass, rubber products, and clothing are made in the vicinity, which also has a beach resort. In nearby Sheerness, captured by the Dutch in 1667, were government dockyards built under Charles II; they closed in 1958.