survey
A scale drawing of a property made by a certified surveyor, showing dimensions, improvements, easements, and encroachments.
When buying a property, the Buyer should always request and review a survey of the property.
Though some of the survey's information may be visible to the naked eye, some of it is not (e.g. easements), so merely inspecting the property in person is not sufficient to have a full picture of what is being purchased.