This one maybe?
There is a 66-letter place name in Wales, according to Dr. David Crystal's Encyclopedia of Language: GORSAFAWDDACHAIDRAIGODANHEDDOGLEDDOLONPENRHYNAREURDRAETHCEREDIGION, meaning "the Mawddach station and its dragon teeth at the Northern Penrhyn Road on the golden beach of Cardigan bay."
http://members.aol.com/gulfhigh2/words12.html