chalk crop downland England english exercise farm field grassland Great Britain hill landscape meadow national park nature summer Sussex track trail view walk direction distance distant fence grass green natural sky slope South Downs travel animal cow cumbria mammal northern pasture rural shadow sheep spring sunlight tree forest steep trees ridge flowers panorama peace plants quality village wild clouds clusters schools shoals Weald autumn bridleway path post bank boundary Devon Exmoor line moor old remote series wilderness cattle cows evening graze herd wander