Pier Seven is the 47th level in Chip's Challenge 1. The level is composed of the outer pier, with seven blocks laying around ice patches, and a huge sea of water with the chips in the center. Pier Seven is named because there is only one location where only seven blocks will bridge the sea; this is located on column 15, from [15, 24] to [15, 17].
The single most important timesaver is, of course, the ice. Use it whenever possible.