Like the 18 other national parks which are pending their official declaration, the area around the Chet Sao Noi waterfall has been unofficially treated as a national park for several years already, as can be seen by the street view of the entrance from 2014. The park covers an area of 26238 rai (41.9802 km²) at the border between Saraburi and Nakhon Ratchasima province and consists of the three forests Thap Khwang (ป่าทับกวาง)and Muak Lek Pleng 1 (ป่ามวกเหล็ก แปลงที่ ๑) - protected in 1984 as a national forest [Gazette] and Dong Phaya Yen (ป่าดงพญาเย็น) created in 1962 [Gazette]. Interestingly, both were not among those national forest announcements I had collected before, the title of the announcements had changed slightly and thus they slipped my previous searches.
The other two new protected areas are non-hunting areas, less protected than National Parks and thus the announcements are done by the Ministry of National Resources and Environment itself. The two new areas are
- Pa Ban Hong non-hunting area (เขตห้ามล่าสัตว์ป่าป่าบ้านโฮง) covering 379 km² in the border of Chiang Mai and Lamphun province [Gazette].
- Doi Phu Kha non-hunting area (เขตห้ามล่าสัตว์ป่าดอยภูคา) covering 119 km² in Nan province [Gazette]. This area wasn't listed as a non-hunting area under creation in any of the lists I found so far, so I am not sure if the official name is correct - the announcement only lists the names of the forests included, not the name of the non-hunting area created.