T.L. Phipson-Wybrants surveyed the lower reaches and delta of what is now known as the Rio Incomati in Mozambique, which reaches the sea just north of Maputo. He died soon thereafter. The results were published in 1883 as "The delta and lower course of the Sabie River, according to the survey of the late Captain T.L. Phipson-Wybrants", in the Proceedings of the Royal Geographical Society (Vol. 5, pp. 271-274).