Oshoek in Mpumalanga is the main border post between South Africa and Swaziland. The N17 national road starts there. The Swaziland side of the border is known as Ngwenya and the road leads directly to Mbabane, the Swazi capital city. The border is open between 07:00 and 00:00
References
Oshoek Wikipedia(Text) CC BY-SA