We claim the ornamental design for seating island, as shown and described.
FIG. 1 is a front or rear view of a seating island;
FIG. 2 is a side view of the seating island;
FIG. 3 is a top view of the seating island;
FIG. 4 is a bottom view of the seating island;
FIG. 5 is a perspective view of the seating island;
FIG. 6 is a front or rear view of an another aspect of the seating island;
FIG. 7 is a side view of the another aspect of the seating island;
FIG. 8 is a top view of the another aspect of the seating island;
FIG. 9 is a bottom view of the another aspect of the seating island; and,
FIG. 10 is a perspective view of the another aspect of the seating island.
Applicant notes that the side view of the seating island as shown in FIGS. 2 and 7 is representative of both a right side view and left side view of the seating island. Any subject matter shown in dashed lines, and any surfaces of the design not shown, including interior surfaces, form no part of the claimed invention.