578 THE FRESH- WATER LOCHS OF SCOTLAND 
feet, is 27 miles in length, from 1 to 6 miles in breadth, and covers 
an area of 68 square miles. In addition to the overflow from Loughs 
Carra and Mask, it receives also the rivers Beatanabrack, which enters 
at the head of the north-west arm, and Clare, which enters at the 
south-east end of the lough, and it discharges by Gal way River into 
Gal way Bay. 
The country to the west of Lough Corrib contains about 130 
lakes, 25 of which are more than a mile in length. These loughs may 
be divided into two divisions — bog-loughs and mountain-loughs. 
Those of the former class are irregular in outline, shallow, and studded 
with islands ; the three largest, forming a chain at the base of the 
Twelve Pins, ^re Loughs Inagh, Derryclare, and Ballynahinch. Those 
of the latter class are deeper and smaller, only four exceeding a mile 
in length. In September 1904, three of the loughs of this district, 
viz. Dhulough, Glencullin, and Nafooey, were sounded by Mr O. J. R. 
Howarth.i Dhulough, one of the mountain type, is about If miles 
in length, and has a maximum depth of 164 feet. Its surface is 108 
feet above sea-level, and a short stream carries its surplus waters to 
the estuary of the Erriff River. Glencullin Lough, to the north-west 
of Dhulough, 20 feet higher, and draining into it, is less than three- 
quarters of a mile long, and has a maximum depth of 27 feet ; it is 
one of the bog type. Lough Nafooey is a mountain-lough, over 2| 
miles in length by about half a mile in maximum breadth, situated 
nearly 94 feet above sea-level, and drained by the River Finny into 
Lough Mask. Howarth's deepest sounding is 148 feet. 
Lough Derg, situated 108 feet above sea-level, on the borders of 
the counties of Galway, Clare, and Tipperary, and traversed by the 
River Shannon, has an area of 49 square miles. Like Lough Corrib, 
it is very irregular in outline, and contains many small islands. The 
maximum depth, obtained off Parker Point, is 119 feet. 
There is another lake of the same name in the south of County 
Donegal, lying in the midst of a desolate mountain region, 457 feet 
above sea-level, and 6 miles long by 4 miles broad, flowing by the 
River Derg into the River Foyle and Lough Foyle. This lake was 
for centuries famous throughout Europe as a place of pilgrimage, 
and on Saints'" Island, near the western shore, stand the ruins of an 
old monastery, destroyed in 1632. 
Lough Ree, another lake in the course of the Shannon River, 
122 feet above sea-level, between the counties of Roscommon, Long- 
ford, and West Meath, is 17 miles in length by 7 miles in maximum 
breadth, and has a maximum depth of 106 feet ; it covers an area 
of approximately 60 square miles. Its shores are very much indented, 
and it contains a number of islands. 
1 Geogr. Journ., vol. xxv. p. 172, 1905. 
