[2] Tesso Nilo National Park houses some of the largest coherent lowland rainforests remaining on Sumatra.

Indonesian Institute of Sciences (LIPI) surveyed forests throughout Sumatra, and also found that Tesso Nilo housed by far the most species.

[citation needed] In November 2009, WWF announced that the park had finally been expanded by 44,492 hectares [3] but encroachment still remains a serious problem.

According to a WWF report published in June 2013, oil palm plantations cover 36,353 ha of the Tesso Nilo forest complex, with two business groups (Asian Agri and Wilmar Groups) being involved in the trade of the oil palm fruit illegally grown inside the national park.

[6] The Belgian government committed to provide 200,000 euros in assistance for the construction of a Sumatran elephant conservation centre in the Tesso Nilo National Park, with the first quarter to be disbursed in 2011.