2010 California Code
Harbors and Navigation Code
Chapter 5. Annexation

6110.  There may be annexed to a district any of the following
territory which is in the same county as the district, or in any
other county:
   a. Any territory contiguous to the district.
   b. Any territory, any point of which touches the district.
   c. 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.
   d. Any territory specified in this section may consist of one or
more separate parcels of land, but it is not necessary that all
parcels shall constitute in the aggregate one tract of land.