You can determine where your property lines are by viewing the written description on the property deed or examining the property survey map prepared at the time of the property's purchase. The survey map includes a map with exact measurements and a drawn diagram of the property.
If you do not have access to a copy of the deed or survey, you may need to hire a land surveyor to draw up the property map indicating the property lines. The surveyor uses professional equipment such as computer mapping software and a GPS to ensure accuracy. Title records available to the public can also assist the surveyor when determining property lines.