Stora Bornö is an island in Gullmarn fjord, belonging to the Lysekil Municipality.
Stora Bornö is about 4 km (2.5 mi) long from north to south and is largely covered with pine forests.
The island's highest point is 110 m (360 ft) above sea level and in many places the shoreline consists of vertical cliffs.
[1] Bornö Marine Research Station is an oceanographic research facility on the island, built in 1902 by Otto Pettersson and Gustaf Ekman [sv].
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