Baker, Samuel White 1821-1893. English explorer, in 1864 the first European to sight Lake Albert Nyanza (now Lake Mobutu Sese Seko) in central Africa, and discover that the river Nile flowed through it. He founded an agricultural colony in Ceylon (now Sri Lanka), built a railway across the Dobruja, and in 1861 set out to discover the source of the Nile. His wife, Florence von Sass, accompanied him. From 1869 to 1873 he was governor general of the Nile equatorial regions.