Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch is a village on the island of Anglesey, in Wales which has the longest name in the United Kingdom. For most purposes, however, the name is abbreviated to Llanfair PG. It is a popular tourist destination, many people stopping at the railway station to have their photos taken next to the station sign, or having their passports stamped at a local shop.
The name is (more or less) Welsh for "St. Mary's Church in a hollow of the white hazel near to the rapid whirlpool and St. Tysil's Church of the red cave". The name was contrived in the 1860's by the village council, specifically for the privilege and prestige of having "the longest name of a railway station in Great Britain". It could not be considered an authentic word from Welsh Gaelic.
A reasonable attempt at a pronunciation would be Clan vire pulth gwinn gith gor gerrick win drob uth clan tay see lee oh go go gogch. (The "gch" in the final syllable is the "glottal h" sound, similar to the sound used in the Yiddish "lochiem")