70 ILCS 1205/11.1-1
The term "harbor", as used in this article includes harbors, marinas, slips, docks, piers, breakwaters, and all buildings, structures, facilities, connections, equipment, parking areas and all other improvements for use in connection therewith.
The term "public waters" has the same meaning as the term defined in Section 18 of "An Act in relation to the regulation of rivers, lakes and streams of the State of Illinois", approved June 10, 1911, as heretofore or hereafter amended.
The term "artificially made or reclaimed land", as used in this article, includes all land which formerly was submerged under the public waters of the State, the title to which is in the State and which has been artificially made or reclaimed in whole or in part.
70 ILCS 1205/11.1-1