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We found this region, with regard to that from
which we had come, to be clearly a hollow, the lowest point being Lake
Kumadau; the point of the ebullition of water as shown by one of
Newman's barometric thermometers, was only between 207-1/2 deg. and 206 deg.,
giving an elevation of not much more than two thousand feet above the
level of the sea. We had descended above two thousand feet in coming to
it from Kolobeng. It is the southern and lowest part of the great river
system beyond, in which large tracts of country are inundated annually
by tropical rains. A little of that water, which in the countries
farther north produces inundation, comes as far south as 20 deg. 20', the
latitude of the upper end of the lake, and instead of flooding the
country, falls into the lake as into a reservoir. It begins to flow down
the Embarrah, which divides into the Rivers Tzo and Teoughe. The Tzo
divides into the Tamunak'le and Mababe; the Tamunak'le discharges itself
into the Zouga, and the Teoughe into the lake.


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