The fens have their own special gods but it takes a special kind of person, and a special situation, to get the gods on your side. Mandru, the Celtic chief, knew just how to do it! Unfortunately, the Romans did not. The Fenlands run from Lincoln in the north to Cambridge in the south. Only a sophisticated drainage system prevents the fens becoming water logged. However, legend has it that the fens were once much drier, providing a landscape of lakes and forests.