Seal Island (43°25'N., 66°01'W.), about 17 miles W of Cape Sable, is the largest and S of a group of five islands extending about 7.5 miles N. The middle of the island is low and sandy, while the N and S ends are wooded and about 15.2m high. Seal Island has been reported to be a good radar target at 14 miles, and to be identifiable with the charted feature from the shape and character of the echoat a distance of 7 miles under normal conditions. Seal Island Light is shown from a white octagonal tower, 21m high, with two red horizontal bands, near the S point of the island. A rectangular building is situated close S of the light.

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