Goerwitz

The Phetchabun Mountains divide Thailand along north-south lines. It wasn't until about a century ago that they ceased to be a major barrier, due to the introduction of systematic rail travel. (Thailand's first railroad was opened in 1896 during the reign of Rama V, i.e., King Chulalongkorn. But this first line only went from Bangkok to Ayutthaya.)

The mountains still mark a strong cultural divide, separating the north (the old kingdom of Lan Na) from the east (the old kingdom of Lan Sang). The kingdom of Lan Sang covered various parts of what's now northeastern Thailand and Laos.

I just think the mountains are pretty.