The ridge and furrow pattern is not altogether obvious on the land itself in this shot but the wavy fence clearly follows the surface & the telephoto lens emphasises the relief.

It is an archaeological pattern of ridges and troughs created by a system of ploughing used in Europe during the Middle Ages, typical of the open field system. The earliest examples date to the immediate post-Roman period and the system was used until the 17th century in some areas. Clearly these fields reverted to grassland and may not have been ploughed for 100s of years!

HFF to everyone. Have a great weekend.