304 THE BEAUTIES OF NATURE CHAP. 



At present the waters of the Valais escape 

 from the Lake of Geneva at the western end, 

 and through the remarkable defile of Fort de 

 1'Ecluse and Malpertius, which has a depth of 

 600 feet, arid is at one place not more than 

 14 feet across. Moreover, at various points 

 round the Lake of Geneva, remains of lake 

 terraces show that the water once stood at a 

 level much higher than the present. One 

 of these is rather more than 250 feet l above 

 the lake. 



A glance at the map will show that be- 

 tween Lausanne and Yverdun there is a low 

 tract of land, and the Venoge, which falls 

 into the Lake of Geneva between Lausanne 

 and Morges, runs within about half a mile of 

 the Nozon, which falls into the Lake of Neu- 

 chatel at Yverdun, the two being connected 

 by the Canal d'Entreroches, and the height 

 of the watershed being only 76 metres (250 

 feet), corresponding with the above mentioned 

 lake terrace. It is evident, therefore, that 

 when the Lake of Geneva stood at the level of 

 the 250 feet terrace the waters ran out, not as 



1 Favre, Bech. Geol. de la Savoie. 



