But the most interesting feature is the barren and desolate country to the east of Lake Dambeling, doubtless a continuation of the same sterile country seen by Mr. Roe, the surveyor-General, east of York many years previously; and probably from Mr. Eyre's observation, extending quite down to the southern coast. We had no means of ascertaining the width of this dreary country, but we did not think it could be impassably wide because the river Lefroy appeared to come across it. This river, in a geographical point of view, may be important, as the character of its bed, without trees, more water-worn than the other rivers of the colony, its size, and the direction from which it comes, render it exceedingly interesting to determine how it is supplied. The sandy nature of the country on its banks, and for many miles east, and the flatness of the country, preclude the idea that it receives its supply of water from the immediately surrounding district. It must either be supplied by a country of a far better character to the eastward, or it is the outlet of another and larger lake far in the interior. From the natives we could learn nothing but that there were no kangaroos, no opossums, and no water to the east; but as their knowledge never extends 100 miles, and they would tell any lie to avoid going where they had no inclination to go, their opinions are worthless. It might be worth the while of the colony to send forth another expedition to determine the boundaries of this desolate country, as it is not improbable that a practicable rout might be discovered to South Australia by means of the river and lakes. The outlet of the lakes is into the river Beaufort, and possibly also into the Gordon. There is no doubt that in exceedingly wet seasons the whole valley is one continuous stream, when all the lakes would be united and present a truly magnificent appearance; but as the area of evaporation is so large, and the banks of many of the lakes are high, the quantity of rain must be enormous before the valley becomes filled with a running river. Lake Barbering, where the valley divides, has a steep shore, with three distinct marks of former water-levels. All the lakes have two or more shores, showing either a decrease of rain or an elevation of the land itself, probably both. Between the present and ancient shores there is a belt of swamp-oaks and tea-trees, which show that some length of time has elapsed since the water left its old levels. The water to fill these large reservoirs must come down the river Lefroy, as the neighbouring country is too sandy to supply it in sufficient quantities.