Map sheet number 143 in the OS Landranger map series is the ideal map to use when planning trips to Ely, Downham Market, Wisbech & the surrounding area. The area in this map holds many attractions including Oliver Cromwell's house, the River Ouse, the Victorian clock tower in Downham Market, & the historic site of Wisbech Castle. With this map you will receive a code for use on your i OS or Android smartphone or tablet. Find our more at Mobile Download FAQ. The OS Landranger map for Ely & Wisbech is available in both the standard paper version & weatherproof " Active" version.