Dong Phaya Yen mountains

Dong Phaya Yen Mountains
The Dong Phaya Yen Mountains rising east of Pa Sak Cholasit Dam
Highest point
Peak	Phu Khing
Elevation	1,167 m (3,829 ft)
Dimensions
Length	170 km (110 mi) NW/SE
Width	40 km (25 mi) NE/SW
Geography
Mountain ranges in northeastern Thailand
Country	Thailand
States/Provinces	List Phetchabun Province Chaiyaphum Province Lopburi Province Saraburi Province Nakhon Ratchasima Province
Range coordinates	14°20′N 102°03′E / 14.33°N 102.05°E / 14.33; 102.05Coordinates: 14°20′N 102°03′E / 14.33°N 102.05°E / 14.33; 102.05
Borders on	Phetchabun Mountains and Sankamphaeng Range
Geology
Type of rock	Sandstone and limestone

Dong Phaya Yen or Dong Phya Yen (Thai: ทิวเขาดงพญาเย็น, pronounced [dōŋ pʰājāː jēn], lit. "jungle of the cold lord") is a mountain range in Phetchabun, Chaiyaphum, Lopburi, Saraburi, and Nakhon Ratchasima Provinces, Thailand.

As the Dong Phaya Yen is less compact and lower in height than the mountain ranges to the north and to the south, the first roads and railroads connecting the region of Isan with the capital Bangkok were built across these mountains. Before the construction of the railroad at the beginning of the 20th century, communication between these two parts of Thailand was difficult. The survey for the building of the Northeastern Line of the State Railway of Thailand began in 1887.

The Dong Phaya Yen Mountains consist mainly of a range of scattered medium-height hills stretching southwards of the Phetchabun Mountains in an arch until reaching the northern side of the Sankamphaeng Range. The mountain chain has a length of about 170 km and reaches a maximum elevation of 1,167 m at Phu Khing at the northern end. Other peaks are 900 m high Khao Phang Yai, 767 m high Khao Kheuan Lan, 782 m high Khao Cham Dot, 718 m high Khao Chalong Tong, 745 m high Khao Chan Luang, 722 m high Khao Lom, 722 m high Khao Sawong, 721 m high Khao Wong Chan Daeng, 689 m high Khao Phrik, 695 m high Khao Somphot, 657 m high Khao Kradon, 676 m high Khao Inthaya, 683 m high Khao Mot Ngam, 655 m high Khao Plai Khlong Kum, and 575 m high Khao Sadao.