Juan Maria Schuver
In March 1881 , he reached Khartoum with a small entourage , and subsequently spent the better part of the next two-plus years performing explorations of southeastern Sudan , particularly the eastern watershed of the White Nile and the hill regions surrounding the upper Blue Nile . 
<triplet> Khartoum <subj> Sudan <obj> country <subj> White Nile <obj> located in or next to body of water <subj> Blue Nile <obj> located in or next to body of water <triplet> White Nile <subj> Sudan <obj> country