Ukonkivi, ("Ukko's Stone"), is located in the Ukonsaari island on the Finnish lake Inari. The area of the lake is called Ukonselkä. Ukonkivi was used by the ancient Sami people as a holy sacrificial place. The name "Ukko" refers to the ancient thunder god of Finnish mythology.
The island is about 30 metres high, 50 metres broad and its length is about 100 metres. The distance from the village of Inari to Ukonkivi is about 11 kilometres. There are guided tours to the site during the summer from the harbour of the Sami museum Siida.
One of the most important archaeological findings in Lapland was made on Ukonsaari island. A silver jewelry fragment was found in 1873 by the British archaeologist Sir Arthur Evans in a sacrificial cave on the island.
The names of some of the many islands adjacent to Ukonsaari may suggest other religious sites, for example;