The Muc-sheilch or Muc-sheilche (pronounced Mook Helluch) is a loch monster reported to live in Loch Maree, and its neighbouring lochs.
Etymology
Loch-na-Bèiste is Scottish Gaelic for loch of the beast, beast often being used for a loch monster in Ireland especially. Seilch would appear to be cognate with selkie; muc generally means a pig, but is also applied to whales as muc-mhara..
Expeditions
Mr Banks of Letterewe tried at great expense to drain Loch-na-Bèiste near Aultbea, in the 1850s, but failed. He also tried to poison it with quicklime.
Theories
It has been suggested that Muc-sheilch may be a large eel.