Pyramid Island is a Kenyan island whose westernmost point is used to demarcate the border between Kenya and Uganda just north of the 1st degree south parallel in Lake Victoria.

Pyramid and Usingo are steep and have either limited[1] or no human habitation.

[3] The other islands associated with the boundary of Uganda and Kenya in Lake Victoria include Sumba, Mageta, Kiringiti, and Ilemba Islands, as shown in surveys conducted by the Colonial Office held in the United Kingdom's National Archives.

[4] The documents above state that the boundary of Uganda runs from the mouth of River Sio in a straight line south-westerly to the most northerly point of Sumba.

From there it follows a straight line southerly to the most western point of Kiringiti Island, thence follows a straight line southerly to the most western point of Ilemba Island before following a straight line southerly again to the westernmost point of Pyramid Island and continuing in a straight line due south to a point on Latitude 1 south.