The commissioners of all counties involved, including the existing port district and the area to be annexed, shall submit the proposition to the voters of such area within their respective counties, at the next election held pursuant to section 34-106, Idaho Code. Except as in this section otherwise provided, the procedure for submitting the proposition shall be the same as herein provided for the original formation of a port district. In submitting the question to the voters for their approval or rejection, the proposition shall be expressed on the ballots substantially in the following terms: