Lough Mask is a freshwater limestone lake in County Mayo. It is the sixth largest lake in Ireland with an area of 20,000 acres. Lough Mask is located to the North of Lough Corrib and is associated with underground currents.

The length of the lake Lough Mask is approximately 10 miles and a maximum width of about 4 miles. The depth of the lake in different areas differs significantly. Its average depth is 15 m, the maximum depth reaches in some places is 58 m. the South-Eastern part of the lake is quite shallow with many Islands.

Because of the huge number of species inhabiting the lake Lough Mask trout, it is very popular among fishing enthusiasts. Every year in Cushlough Bay (near the town Ballinrobe) held the world Cup for the title of "champion of trout fishing".

It should be noted that fishing is not the only entertainment on the lake of Lough Mask. There is also "Petersburg Outdoor Education Center" near the island bly, where you can enjoy a variety of water sports, including kayaking, Canoeing, sailing, etc. a Lot of fun you will get, and just walking in the picturesque surroundings of Lough Mask, or going on one of the Islands – for example, the island Irishmen where the ruins of the ancient Celtic Church of the Holy Cormac founded in the 6th century.

However, it is worth visiting the lake and are interested in the paranormal. Researchers specializing in this area, claim that on the lake of Lough Mask was recorded suspicious activity. Legends and shrouded island bly, where, as legend has it, lives Banshees – a very prominent figure in Irish folklore.