burst danger England english fields flood gate grass Great Britain lake landscape meadows natural nature pond pool river spate Sussex trees water winter country countryside field forest green hills meadow peace rural South Downs summer view animal cow cumbria farm fence hill mammal northern pasture shadow sheep spring sunlight tree bridleway direction hike journey path ridge sky space track travel walk walker cereal cloud crop grain harvest heads ready ripe stalks Triticum wheat chalk downland exercise grassland national park trail flowers panorama plants quality village wild clouds clusters schools shoals Weald