The R603 is a Regional Route in South Africa. Its north-western terminus is the N3 near Camperdown, KwaZulu-Natal. It initially heads south, crossing the R103. It then passes just west of Mpumalanga and, after 15 kilometres, it intersects with the R624's eastern terminus, and heads south-east. It ends at an interchange with the N2 at Kingsburgh.
Map of R603, South Africa
References
R603 road (South Africa) Wikipedia(Text) CC BY-SA