Hobulaid is located between the island of Vormsi and the ferry port of Rohuküla on the Estonian mainland. Hobulaid has an area of 75 hectares. The highest point is 6.6 metres above sea level.
The island was first mentioned in chronicles in 1391 and had a history of Swedish colonization. In the Middle Ages Hobulaid belonged to the Bishopric of Ösel-Wiek of Haapsalu. Today, the island is an important breeding ground for numerous bird species.