What is "sedudu"

Sedudu Island (known as Kasikili Island in Namibia) is a fluvial island in Botswana, formed in the Chobe River adjacent to the border with Namibia which runs down the thalweg of the river immediately north of the island. The island was the subject of a territorial dispute between these countries, resolved by a 1999 decision of the International Court of Justice (ICJ) which ruled in favour of Botswana. The island is approximately in area, with no permanent residents. For several months each year, beginning around March, the island is submerged by floods.