2 BATHYMETRICAL SURVEY OF 



-Loch Brora is extremely irregular in conformation, varying greatly in 

 width, with corresponding undulations of the lake-floor. There are four 

 basins, in which the depth exceeds 30 feet. Proceeding from the foot of 

 the loch the first, smallest, and shallowest basin has a maximum depth of 

 31 feet. Passing through the first narrows, where a depth of 7 feet was 

 observed, one enters the second expansion of the loch, which is shallow 

 until Eilean nam Faoileag is passed, the second basin lying to the north of 



English Mites 



Bartholomew 



FIG. 1. INDEX MAP OF THE BRORA, HELMSDALE, WICK, WESTER, HEILEN, DUNNET, 

 THURSO, AND FORSS BASINS. 



that island, and having a maximum depth of 43 feet. Passing through the 

 second narrows, where a depth of 9 feet was found, one enters the third 

 and deepest basin, enclosing the maximum depth of 66 feet, which was 

 recorded approximately near the centre of the basin. Passing through the 

 third and most northerly narrows, in which depths of 4 and 7 feet were 

 recorded, one enters the fourth and largest basin ; this basin is cut into 

 two portions by the slight shoaling of the bottom where the alluvial cone 



