Eastleigh is in Hampshire, England, and the main town in the Borough of Eastleigh. The town lies between Southampton and Winchester, and is part of the South Hampshire conurbation. The first substantial growth was as a railway town. Now it is home to many businesses, including a manufacturing plant owned by Prysmian Cables & Systems (formerly the cables division of Pirelli). The town lies on the River Itchen, one of England's premier chalk streams for fly fishing, a designated site of Special Scientific Interest.