1. Any territory contiguous to the district.
2. Any territory any point of which touches any point of the district.
3. Any territory separated from the district by a “separating barrier,” which term includes a street, road, highway, railway line, railway crossing, railway right-of-way, watercourse, lagoon or other natural barrier.
4. Territory which is not contiguous to the district.
(Added to NRS by 1969, 793)