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Harilaid (Swedish Hares, formerly Gräsö) is small uninhabited island in Estonia. It lies about 4 kilometres west of the island of Vormsi. It should not be confused with the larger former island of Harilaid which is now a peninsula on the northwest coast of the island of Saaremaa.
Harilaid has an area of 15 hectares. Its highest point is 2.9 metres above sea level. The island is stony, with a covering of juniper.
A lighthouse was first built on Harilaid in 1849. The present lighthouse is 19 metres high.