sentences:  It was created in 1999 from parts of Lambton, Chatham—Kent and Middlesex when ridings were redistributed to match their federal counterparts.From 1999 to 2007 the riding consisted of the municipalities of Lambton Shores, Warwick, Brooke-Alvinston, Dawn-Euphemia, Southwest Middlesex, Newbury, Adelaide Metcalfe, Strathroy-Caradoc, Oneida 41, Chippewas of the Thames First Nation 42, Plympton-Wyoming, Enniskillen, Petrolia, Oil Springs, Walpole Island 46, Chatham-Kent north of the Thames River and not including the former city of Chatham, and the southwest third of North Middlesex.In 2007, the riding was redistributed, and it lost Plympton-Wyoming, Enniskillen, Petrolia, Oil Springs while it gained the rest of North Middlesex, Lucan Biddulph and Middlesex Centre.