Chapter 2
Jurisdiction of South African Courts and Institution od Prosecutions in South African Courts in Respect of Crimes (ss 4-5)
4 Jurisdiction of South African courts in respect of crimes
(3) In order to secure the jurisdiction of a South African court for purposes of this Chapter, any person who commits a crime contemplated in subsection (1) outside the territory of the Republic, is deemed to have committed that crime in the territory of the Republic if
(a) that person is a South African citizen
Nationality jurisdiction - national proceedings
EDIT.