I love seeing these ridges in the fields around here. It makes my mind boggle to think that they are the remnants of a farming system which dates back to the middle ages, so at least 600 years ago. The ridges and furrows remain because the land has not been ploughed since those time.
At that time a family would farm an individual strip of land. Each strip was about 220 yards long - a furlong (furrow - long.)
really lovely to see the ridge and furrow strips still in place - I got to survey a field as a primary school exercise because it still had the ridges and furrows, just before it was built on for housing