Far Isles, Foreign Isles; Lontaignes Iles, - Illes; Lontaines Iles, Remote Isles, Strange Isles
An archipelago near the country of Sorelois, mentioned several times in the Vulgate romances.
One of Distant Isles was the Giantís Isle, which held the Castle of Tears and was conquered by Tristan (Tristram). In the Post-Vulgate Merlin continuation and in Malory, the King of the Distant Isles was one five kings who invaded Britain, and who were slain by Arthurís men at the battle of the Humber.
Some evidence points to a Welsh location for Surluse; Holyhead and Anglesey (which are more roundish than long) have already been assigned to King Pellinore on stronger evidence. Islay, Jura, Kintyre, and Arran, in Scotland, certainly answer the description of "long islands", and the fact that they are far distant from Wales may be secondary to a conqueror of Galeholt's caliber.
Five Kings | The Legend of King Arthur