The Helgoland-Zanzibar Treaty (German: Helgoland-Zanzibar Treaty) was an agreement signed on 1 July 1890 between the German Empire and Great Britain. 2. To the south, on the line that begins on the coast of the northern border of Mozambique province and follows the route of the Rovuma River to the point where the brass flows into the Rovuma. From there, the road is to the west on the parallel of latitude with the shore of Lake Nyasa. Turning north, it continues along the east, north and west shores of the lake until it reaches the north shore of the mouth of the Songwe River. Then it goes up to its intersection point with the 33rd degree of east length. The route runs along the river to its nearest point with the border of the Congo Basin, as described in Article I of the Berlin conference and marked on the map attached to its ninth minutes. From there, the route runs directly to the border described above, follows it to the intersection with the 32nd degree of east longitude, turns and leads directly to the meeting point of the northern and southern branches of the Kilambo River. It follows this river until it flows into Lake Tanganjika. On behalf of their respective governments, they reached the following agreement after discussing various issues relating to the colonial interests of Germany and Great Britain: 1. To the north, by the line that begins on the north bank of the mouth of the Umba River, passes directly to Lake Jipe and, after passing on the east shore and around the north shore of the lake. , crosses the Lumi River and crosses the territories of Taveta and Chaga.

Around the northern slope of the Kilimanjaro Mountains, this line leads to the point of the eastern shore of Lake Victoria-Nyanza, which is cut by the 1st degree of south latitude. It crosses the lake on this parallel and follows it to the border of the Free State of Congo, where it ends. It is obvious, however, that the German sphere of interest on the west side of the lake does not include Mount Mfumbiro. If it turns out that this mountain is south of the parallel of latitude mentioned above, the demarcation line must be drawn in such a way as to exclude the mountain from the German circle of interest; however, the line ends at the location described above. The misleading name of the contract was introduced by former Chancellor Otto von Bismarck, who was preparing to attack his despised successor, Caprivi, to conclude an agreement reached by Bismarck himself during his management.