California Code, Government Code - GOV § 6580

(a) “Joint county park board” means a board, commission, or other public entity organized pursuant to an agreement made in accordance with Article 1 (commencing with Section 6500) of this chapter for the purpose of improving, operating, and maintaining a single park or other recreation facility located within more than one county, if none of the territory within the park or other recreation facility is contained within an incorporated city, and further, if all of the counties within which the park or other recreation facility is located are parties to the agreement creating the board, commission, or other public entity.

(b) “Counties” means all of the counties within which a portion of the park or other recreation facility, operated and maintained by a joint county park board, is located.

(c) “Park” means a park or other recreation facility operated and maintained by a joint county park board.