A Polish national was killed and five other people, including the pilot, were injured when a light aircraft they were flying in on a tour over Lake Naivasha crashed on Thursday, police said.
The light aeroplane was flying across the lake, some 104 km (65 miles) northwest of the capital Nairobi, when the accident occurred at around midday.
Civil aviation authority investigators were trying to establish the causes of the crash.
Apart from the dead person, who was a woman, the other occupants were the Kenyan pilot and four passengers from Britain.
The lake is home to a variety of types of wildlife including over 400 different species of bird and a sizeable population of hippos. The fish community in the lake has been highly variable over time, influenced by changes in climate, fishing effort and the introduction of invasive species.