| Location | Sälskär island |
| Municipality | Hammarland |
| State | Finnish |
| Completion year | 1868 |
| automated | 1949 |
| Height | greater than 30 m |
| light height | 44 m |
| light carrier | 12 km |
| Year first constructed | 1840 (first) |
|---|---|
| Year first lit | 1920 (current) 1859 (second) |
| Automated | 1961 |
| Foundation | masonry |
| Construction | reinforced concrete |
| Tower shape | square frustum tower with balcony and lantern |
| Markings / pattern | red tower, white lantern |
| Height | 23 metres (75 ft) |
| Focal height | 42 metres (138 ft) |
| Light source | wind power |
| Range | 11 nautical miles (20 km; 13 mi) |
1962. Active; focal plane 20 m (66 ft); two quick white flashes every 5 s. 6 m (20 ft) square pyramidal skeletal tower with slatted daymarks on two sides. The lighthouse is colored by a red-brown stain and is described in the light lists as red. Kenneth Björklund has a closeup photo, another closeup photo is available, and the beacon appears on a postage stamp, but Google has only a fuzzy satellite view of the island. Located on a small island on the north side of the Åland archipelago. Accessible only by boat. Site open, tower closed. ARLHS ALA-015; Admiralty C4464.4.
4. Market Lighthouse
1885 (Georg Schreck). Active; focal plane 17 m (56 ft); white flash every 5 s. 14 m (46 ft) octagonal cylindrical stone tower with lantern and gallery, rising from a 2-story stone keeper's house. Entire structure painted with red and white horizontal bands. A photo is at right, a 2010 photo was taken on the 125th anniversary of the lighthouse, Wikipedia has a closeup photo by Thierry Caro as well as additional photos, and Google has a satellite view. Märket, the westernmost land of the Åland archipelago, is a very small island, about 350 m (1150 ft) long by 150 m (490 ft) wide. However, it is a famous geographical curiosity. The 1809 Treaty of Fredrickshamn, in which Sweden ceded sovereignty over Finland to the Russian Empire, specified that the international border should run through the island of Märket, so that the sea passage to the east of the island would be Russian and that to the west would be Swedish. When the Russian administration had the lighthouse built in 1885, the builders placed it on the highest ground available, which happened to lie in the Swedish half. For a century, Russia and then Finland operated the lighthouse in Swedish territory. In 1981, Sweden and Finland signed a treaty in which the ground under the lighthouse was transferred to Finland in return for an equal area of land in the Finnish half. As a result, the border now snakes across the tiny island in an intricate inverted-S curve, and the lighthouse is finally in Finland. The Finnish half of the island has a distinct radio prefix OJØ and amateur radio operators consider it a separate country. The lighthouse was automated in 1979 and fell into poor condition, so the Finnish Lighthouse Society launched a fundraising campaign for its restoration. In 2009 the lighthouse was repainted and refurbished, with much of the work done by the Society's volunteers.
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