Is 'land' inclusive of walls, windows, fields, and marches?
Any natural or human-caused accretion to land is considered part of it. Any man-made structures, such as walls and windows built to get permanently linked to the land, are examples of such accretion.
The land also comprises natural formations such as farms and meadows. So walls, windows, and fields are human creations and do not appear naturally. These things are not included in the definition.