Government Code § 23234
ARTICLE 4.5. Alteration of Boundaries
A petition shall contain in substance the following:
(a) An accurate description of the proposed new boundary line as it will appear or exist if the existing boundary line is changed, altered and reformed.
(b) A statement that the proposed new boundary line does not pass through or divide the territory of any incorporated city.
(c) A statement of the area in square miles of the territory proposed to be transferred.
(d) A statement of the population which will remain in each of the counties affected.
(e) The name of the transferring and accepting counties.