10 °C at night. Good time for hiking. Hot season (March–April): Humid with daytime temperatures of 20–30 °C and 17 °C at night. Geology Limestone is present towards the eastern end close to the Dângrêk Mountains. Sandstone outcrops exist in the south and north of the park. Shales and schist are also present. In the south, steep slopes made of granite and conglomerates are seen. Drainage There are four drainage areas in the park which are vital catchments for four river systems. The Lam Takhong River drains from the central Khao Yai area and runs in a northeasterly direction to the Mekong. The Sai Yai River system drains from the eastern basin, turning sharply into the southern floodplains and on to the Gulf of Thailand. The Nakhon Nayok River system drains from the southwest watershed into Nakhon Nayok Province to the south. The Saraburi Province drainage system drains westward from the far west of Khao Yai. Fauna Khao Yai is home to a variety of animals. It is one of the few places in Thailand where wild elephants still survive. They are regularly seen and are a major tourist attraction. Other larger animals include gibbons, pig-tailed macaques, muntjacs and sambar deer. Other large animals include barking deer, porcupine, and civet. Other species that can occasionally be seen include sun bear, Asian black bear, gaur, otter, dhole and jackal. In early-2017 it was announced that 18 tigers, including five males, seven female and six cubs, were filmed by surveillance cameras in the Dong Phaya Yen-Khao Yai world heritage site in June 2016 and February 2017 in a joint effort of the Department of National Parks, the Freeland Foundation, and the Panthera Corporation. The last time that tigers were seen by surveillance cameras in Khao Yai National Park was in 2002. Tribute On 18 September 2017, Google celebrated the 55th anniversary of Khao Yai National Park with a Google Doodle. See also Dong Phayayen - Khao Yai Forest Complex Sankamphaeng Range List of national parks of Thailand List of Protected Areas Regional Offices of Thailand References External links National Park Division Mammals, birds and reptiles of Khao Yai National Park thaibirding.com on Khao Yai National Park List of Birds of Khao Yai National Park National parks of Thailand ASEAN heritage parks World Heritage Sites in Thailand Isan Tourist attractions in Nakhon Ratchasima province Tourist attractions in Saraburi province Tourist attractions in Prachinburi