The other kind of geographic area is the "service district". Circumstances vary according to laws of various states, but the essential distinguishing feature between these two types of districts is this: a service district is composed of all individual parcels of land that are somehow connected to the public improvement for which the special assessment is to be levied. The special assessment district consists of only those properties which are designated by the applicable law as having received a specific and unique "benefit" from the public improvement.