Gunong Senyum or the Smiling Mountain Recreational Park, at 1,549 metres above sea level is an important archeological site. It is located on the Pahang River bank about 68 kilometres away from the town of Temerloh via kampung Awah and Felda Jengka 18.
The park is a part of the Jengka Forest Reserve, which covers an area of 794 hectares. Surrounded by oil palm plantations of the Jengka Felda scheme, there are two main mountains within the park, Gunong Senyum and Gunong Jebak Puyoh, the former being a popular spot to tourist and researchers.
Gunong Senyum is made up of limestone and rock, estimated to be around 3,000 years old, whilst the lowlands on the east is made of mudstone and shale estimated at around 2,100 years old.
There are 19 caves found within the park, and among the caves that arouse greater interest to scientific researchers and archeologists :
Gua Terang Bulan
Gua Taman Satu
Gua Taman Dua
Gua Kolam Tuju