Maidhim Talmhain [Mountallon] castle is a half ruined square
within one mile of [Teerovannan Castle].
Both of them being convenient to Loch an Dúin or Doon
Lake, as it is called, and in which it is asserted the top of a castle
can be seen on a clear day under water.
From 
Letters
on the Antiquities of County Clare, 1835 by Eugene O’Curry
Description in
Ordnance
Survey Letters by J. O’Donovan and E. Curry, 1839
Search the online
photographic collection for images of Mountallon
Castle
On 1842 Ordnance Survey Map (using GenMaps)
On Bing maps satellite view (using GenMaps)
On Bing maps satellite view with OS Map overlay showing all monuments and enclosures (using GenMaps)
