1984 the park was made an ASEAN Heritage Park, and on 14 July 2005 the park, together with other parks in the same range and in the Dong Phaya Yen Mountains further north, was proclaimed a UNESCO World Heritage Site under the name "Dong Phaya Yen–Khao Yai Forest Complex". As the lands adjacent to the national park are becoming increasingly developed into luxury hotels and golf courses, acquiring land for future wildlife conservation efforts is becoming problematic. Homes and residential villas have been built illegally within the limits of the protected area of the forest. Illegal logging is also a problem in the area of the park. Key mountains Khao Rom (เขาร่ม) Khao Rom is the highest mountain in Khao Yai National Park, measuring up to 1,351 meters above sea level. Reaching the peak of the mountain is only accessible on foot, which few people attempt to, except for forestry officers Khao Laem (เขาแหลม) Since this mountain is spiral shaped, it is called Khao Laem (เขาแหลม; Lit: Spiky Mountain). Khao Laem is the park's 2nd highest mountain, the highest being Khao Rom. Similar to Khao Rom, reaching the peak of the mountain is also only possible on foot. Reaching the peak of the mountain takes no less than 7 hours. Before reaching the absolute summit, one must also climb up a rope. With such difficult challenges climbing the mountain, The Lottery Club once awarded a 60,000 baht prize to a woman who would conquer the summit of the peak. The recipient of the award, Catherine B. Buri, conquered the summit in 1972. The path used to travel to the summit of the mountain is also used as a wildlife corridor by animals, therefore many animal tracks are found here. Ascending the mountain also affords the opportunity of seeing various forms of wildlife. Tourist attractions Haew Narok Waterfall (น้ำตกเหวนรก) Haew Narok is a waterfall formed from Tha Dan canal. It is known as one of the tallest and most beautiful waterfalls of Khao Yai National Park. Originally, before the Prachin Buri - Khao Yai road was cut, it is only accessible on foot and would take at least 6 hours to make it there, but after the finishing of the Prachin Buri - Khao Yai road, it is easily accessible by cars since the road passes near Haew Narok Waterfall. There is a parking lot just 1 kilometer away from the