See Full Constitution
Article VIII

Section 9. When debt-incurring power of certain counties shall cease

Whenever the boundaries of any city are the same as those of a county, or when any city includes within its boundaries more than one county, the power of any county wholly included within such city to contract indebtedness shall cease, but the indebtedness of such county shall not, for the purposes of this article, be included as a part of the city indebtedness.