The place with the longest name in Scotland rendered as one word was likely Drimtaidhvrickhillichattan on Mull.
Until the early 19th century, every August for 1 week, it held the largest fair in the West Highlands.
From Gaelic “Druim Taigh Mhic ‘ille Chatain” meaning ‘ridge of the house of the son of Gille Chatain’.
The Canmore site has more information on the fair and some aerial photos of the ruins.