The Lo­rian swamp in the north-west cor­ner of the coun­try is in the rainy sea­son for the most part a morass with a cir­cum­fer­ence of about 60 to 70 miles, but hav­ing mod­er­ately deep pools of wa­ter sur­rounded by reeds. In the dry sea­son it is a mud flat with a per­ma­nent sup­ply of wa­ter in its midst. This swamp is sup­plied from the slopes of the Ab­er­dare moun­tains and Mount Kenya with wa­ter which en­ters it by the E. Uaso Nyiro river. There is a clearly de­fined river-bed, called the Lak Dera, con­nect­ing the Lo­rian swamp with the Wama lake. This river-bed is now dry, but the na­tives re­port that wa­ter has been known to flow down it as far as Af­madu (black mouth), which is a dis­trict about 30 miles from the river Juba.

The gen­eral di­rec­tion of the above-men­tioned Lak Dera (long stream) is east un­til it reaches the Af­madu dis­trict, where it is joined by the Lak Jera river-bed, and this has a stream of wa­ter dur­ing the sea­son of heavy rains. Af­ter pass­ing Af­madu the united river-bed turns al­most due south un­til it reaches the Deshek Wama (Wama lake), a lake which for­merly had per­ma­nent wa­ter ex­tend­ing 16 miles in length by about 2 miles in breadth. This lake was for­merly fed by a stream pro­ceed­ing from the river Juba at a point about 50 miles from its mouth, and it was drained by an­other stream en­ter­ing the Juba 20 miles from its mouth, near the town of Yonti (noisy place).

The feed­ing stream has been lately blocked by an ar­ti­fi­cial bank, and the lake is now dry ex­cept in the rainy sea­son.

To­wards the south-west of Juba­land ex­ists a plateau of slight el­e­va­tion. From this in the rainy sea­son a con­sid­er­able amount of wa­ter flows into a se­ries of swamps, drained by two creeks en­ter­ing the sea by a com­mon mouth at Port Durn­ford. These swamps are called by the gen­eral name of Wama Eidu.