Final answer:
A landmark may be a natural object like a tree or boulder, or an artificial object such as a steel rod; these serve as reference points in geography.
Step-by-step explanation:
The object that may be a natural object, such as a tree or a boulder, or an artificial object, such as a steel rod or a stake driven into the ground is a landmark. Landmarks serve as important points of reference in physical geography and can be either natural or man-made. They are often used to mark significant locations and can influence the way in which people navigate environments and form political boundaries. Examples of natural landmarks include mountains and rivers, while artificial landmarks might include buildings, monuments, or even smaller structures like stakes.