he Lincolnshire countryside comprises flatland that includes the fertile, drained marshland of the Fens to the south-east and, to the north, the hills of Lincoln Wolds. While fishing is important along the coast, agriculture dominates the economy inland. The county is the bulb-growing centre of England. The area was occupied by the Romans, who began work on the draining of the Fens and founded the garrison town of Lindum on a hill-top site beside the River Witham. The city of modern-day Lincoln is visible for miles around and the triple towers of its 900-year-old cathedral dominate the skyline, as do windmills in many parts of Lincolnshire.