While exploring the Victoria Lake, Stanley had ascended a few miles up the Kagera, and was even then struck with its great volume and depth, so much so as to rank it as the principal affluent of the Victoria Lake. On this occasion he discovered, on sounding, that it was fifty-two feet deep and fifty yards wide. Proceeding on his voyage up the river for three days, he came to another lake about nine miles in length and a mile in width, situate on the right hand of the stream. At the southern end of this lake they came to the island of Unyamubi, a mile and a half in length. Ascending the highest point on the island, the secret of the Kagera or Ingezi was revealed. Standing in the middle of the island, he perceived it was about three miles from the coast of Karagwe and three miles from the coast of Kishakka west, so that the width of the Ingezi at this point was about six miles, and north it stretched away broader, and beyond the horizon green papyri mixed with broad gray gleams of water. He also discovered, after further exploration, that the expanses of papyri floated over a depth of from nine to fourteen feet of water; that the papyri, in fact, covered a large portion of a long, shallow lake; that the river, though apparently a mere swift flowing body of water, confined apparently within proper banks by dense tall fields of papyri, was a mere current, and that underneath the papyri it supplied a lake varying from five to fourteen miles in width and about eighty geographical miles in length. [Illustration: A SHORE SCENE ON LAKE WINDERMERE.] On exploring the Kagera throughout its entire length (eighty miles) Stanley found that it maintains almost the same volume and almost the same width, discharging its surplus waters to the right and to the left, as it flows on, feeding, by means of the underground channels what might be called by an observer on land, seventeen separate lakes, but which are in reality one lake, connected together underneath the fields of papyri, and by lagoon-like channels meandering tortuously enough between detached fields of the most prolific reed. The open expanses of water are called by the natives so many “rwerus” or lakes; the lagoons connecting them and the reed-covered water are known by the name of “ingezi.” Lake Windermere is one of these rwerus, and is nine miles in extreme length and from one to three miles in width. By boiling point Stanley ascertained it to be at an altitude of 3760 feet above the ocean, and about 320 feet above Lake Victoria.