Siayan is an uninhabited island of Batanes, the northernmost archipelagic province of the Philippines.University of Georgia, Yami culture of Taiwan, Retrieved on 2010-08-24 The island is about 1/2 mile to 3/4 miles in diameter and lies about north-northeastward of Itbayat Island. Its name is derived from the Itbayaten word for "separate", referencing its separation from the main island of Itbayat.
The closest island to Siayan is the A'li Islet to the north; followed by Mavudis Island (Ditarem), which is about north-northeast of Siayan. There are several detached rocks off Siayan's northeastern side, rendering the channel between it and Mavudis unsafe for larger vessels.U.S. Coast and Geodetic Survey, Department of Commerce. United States Coast Pilot, Philippine Islands Part I, p. 39. Washington Government Printing Office, 1919.
Siayan has an elevation of and is listed as an inactive volcano, by the Philippine Institute of Volcanology and Seismology.PHILVOCS, List of Inactive Volcanoes in the Philippines. Retrieved on 2010-08-24. The highest peak in the island is a volcanic pinnacle known as Domnayjang.
See also List of islands of the Philippines
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