 A few weeks later Sidi Mubarak Bombay confirmed via locals that the river flowed into the lake; however, since neither man actually saw this river, this remained a source of speculation.They had also heard of a second lake to the north-east, and in May 1858, they decided to explore it on the way back to the coast.But Burton was too weak to make the trip and thus stayed in base camp when the main caravan halted again at Kazeh.