If one said that they lived outside of Boston what type of location are they using?

If someone says they live "outside of Boston," they are using a relative location, which describes their position in relation to a well-known reference point—in this case, the city of Boston. This phrase typically indicates that they reside in a suburb or surrounding area rather than within the city limits. Relative locations often help convey a sense of proximity and context without specifying exact coordinates or addresses.