River Island – Southend-on-Sea – Opening Hours & Store Details River Island is located prominently at 117b High Street, approximately a 0.61 mile drive south-east of the centre of Southend-on-Sea (nearby Southend Central Station). The fashion store is situated in a convenient location for patrons from Southchurch, Prittlewell, Westcliff-on-Sea, Southend-on-Sea Town Centre, Southend Victoria, Milton, Ekco Park and Southend Central. On this page you’ll find all the up-to-date information about River Island Southend-on-Sea, including the hours of business, address description, customer rating, and other info.