The Muc-sheilch(e) (Scottish Gaelic pronunciation: [muxkˈhelɪçə]) is a loch monster reported to live in Loch Maree, and its neighbouring lochs.

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. Loch-na-Bèiste is Scottish Gaelic for "loch of the beast", beast often being used for a loch monster in Ireland 

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especially. The term loosely translates as "turtle-pig".

It has been suggested that it may be a large eel.

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