70 ILCS 1205/3-10.1

Territory which is not contiguous to a park district but is separated therefrom only by a forest preserve district may be annexed to the park district in the manner provided in Section 3-1, 3-2, 3-4 or 3-10, but the territory of the forest preserve district shall not be annexed to the park district nor shall the territory of the forest preserve district be subject to rights-of-way for access or services between the parts of the park district separated by the forest preserve district without the consent of the governing body of the forest preserve district.