Heligoland–Zanzibar Treaty

The Heligoland–Zanzibar Treaty (German: Helgoland-Sansibar-Vertrag; also known as the Anglo-German Agreement of 1890) was an agreement signed on 1 July 1890 between Germany and the United Kingdom. The accord gave Germany control of the Caprivi Strip (a ribbon of land that gave German South-West Africa access to the Zambezi River), the strategically located archipelago of Heligoland in the North Sea, and the heartland of German East Africa.

Source: Wikipedia — Heligoland–Zanzibar Treaty (CC BY-SA 4.0)