- Secunda is a city in the Mpumalanga province of South Africa. It is located about 140 kilometers east of Johannesburg and 180 kilometers west of the Kruger National Park. Secunda is known for its coal-mining industry and is home to one of the largest coal-to-liquids plants in the world. The city has a population of approximately 110,000 people and offers various amenities such as shopping centers, schools, and recreational facilities.