The province and town of Phetchabun lie in a remote, relatively difficult to access long valley (Pasak Valley) in the Phetchabun Mountain Range. It's counted to the lower north of Thailand, but in fact it's a geographic junction between central Thailand, Isan and the north.
Embedded in plains through which Nam Pasak, a smaller river, curves it's way, the horizons to the east and west are paralleled by the two ranges of the Phetchabun Mountains. Access to the valley was traditionally only through it's natural openings in the south and north. Nowadays, following excessive logging, two major roads cross the mountains and link the valley, which is Phetchabun Province, additionally with the outside world, namely Phitsanulok and Chum Phae (Khon Kaen Province).
The main road through Pasak Valley is Thai Highway 21 (Khotchaseni Road). It links the town with Saraburi and Lopburi in the south and ends in Lom Sak north of Phetchabun town from where Highway 203 continues to Loei.
The climate is subtropical and therefore hot and often humid. Monsoon rains appear mostly in the months from May to September, while September is the most rainy month. March and April are the hottest. The time from November to February is rather dry and relatively cool.
The economy is widely coined by agriculture, that is rice cultivation in the fertile plains, together with tamarind, fruits, maize, tobacco, cotton, oranges and livestock. Cabbage and a number of other vegetables can be added. Teak plantations appear at the foot of the eastern mountain range. Also rubber trees grow here. Fishing in Nam Pasak and many lakes and ponds provides a share of the diet. Part of the economy is trade, represented by the usual retailers in town. In the last years the unavoidable big chains like Tesco Lotus, Big C, Macro, Home Pro and others placed huge branches at the town's periphery and are fighting the local retailers down with dumping prices until they rule the market.
There is no tourism at all in town, and, apart from Si Thep Historical Park 130km south of town, no tourist potential at all. The only occasional Westerners one get's to see here are the expats who settled down here with their Thai wifes.
Alltogether Phetchabun is, compared to other parts of Thailand, underdeveloped and has no producing industries. In the countryside it looks rather poor.
Due to the area's remoteness, it's laid-back and life goes slowly. The people are following widely their traditional way of life, based on fatalism, stereotypy and superstition, however meanwhile enriched with the high-tech and the false promises of the digitalized world.
Supposedly the rural population consists by a great deal of the descendants of Khmer who were brought from Cambodia in the decades around 1800 CE as a slave population and forced to settle down in the region, probably together with Laotions who before lived on the eastern banks of the Mekong River and shared the same fate (a pattern widely used by the Siamese conquerers in the early 19th century, particularly after the Laotion uprise in 1826). In Phetchabun town live a number of wealthy Thai and Thai/Chinese who are in the economic and administrative key positions. The mentality here is clearly different from that in other parts of Thailand. A certain xenophobia lies in the air behind the surface, what is not untypical for regions in which few foreigners live. The term 'farang' is often to hear when being around. Still, many people are friendly and helpful, while others are curious about foreigners and are glad to have what to talk about.
The educational level is low. Very, very low. In 2015 I met a connoisseur of Thailand who claimed that the Thai youngsters in the age of fifteen years old now loose one IQ point per year. As experts often point out, the educational level of a people correlates with the degree of social (in)equality.
Also remarkable is the fact that a significant part of the population is nowadays heavily overweight, often already from childhood on. Low education and unhealthy lifestyle come together.
Following official statistics, Phetchabun town has below 25,000 inhabitants while the whole province has a population of almost a million. That seems disproportional and since the town is not that small, I would suppose the urban population as much bigger than the given figure above.
The number of vehicles is, as everywhere in nowadays Southeast Asia, booming. The streets get filled with cars, trucks and, above all, motorbikes. New roads are continuously built and others widened to provide capacity for the swelling traffic disaster. Remarkable are the many redlights in town, of who are most not only of no need but clearly blocking the traffic.
The best and easiest way to organize traffic at crossroads is a roundabout. Once built, it requires practically no maintainance and does not cause additional costs. Roundabouts keep the traffic in flow and avoid unneccessary waiting times. Redlights therefore are expensive and their maintainance costs the community permanently money. In Phetchabun (I observed the same thing in Saraburi), the redlights are switched clockwise, so that three parties have to wait while one party is free to drive for a few seconds. Verymost of the time the redlights are, as their name indicates, red. Since this repeats from crossroad to crossroad, unnessecary waiting times add up. Often traffic is blocked for long, while no one is benefiting from the green at another side.
Why the decision has been made in such an unfavourable way remains a subject for speculation. Generally, not only in Thailand, the principle 'profit over people' leads to such lucrative business deals between communities and corporations (like electronics producers).
Another method to boost automobilism is to destruct public transport. There is practically no public transport inside of town. Those, who don't drive an own vehicle have to pay for one of the few samlots (motorbike rikshaws), who are concentrated mostly around the bus station at highway 21. Elsewhere, one usually never sees one around.
For trips around town are the first choice for short-distance trips, that is within a radius of 30km, 40km, the songtheaws. That's kind of a pickup which truck bed has been altered and equipped with two long benches for passengers.
For intercity trips are two [!] bus stations in town. One is at highway 21, where buses from Bangkok, Lopburi and Saraburi go and arrive. Another bus station is about two kilometers east of it, in a new part of town.
See also: 'Traffic in Thailand'.
The large valley between the two Phetchabun Mountain Ranges embeds a number of creeks who feed a central stream. Pasak River (Nam Pasak) origins at Dan Sai in Loei Province. It later joins Lopburi River and more downstream becomes a tributary of the Chao Phraya at Ayutthaya (near Phom Phet Fortress, southeast of the old city).
Pasak is altogether 513km long and drains a watershed of roughly 16,000km2 to 18,000km2. The annual discharge is given as large as 2,4km3. Since the water level varies seasonably considerable over the year, for flood and irrigation purposes, in 1994 the Pasak Cholasid Dam has been built in Lopburi Province. The dam provides a modest 6.7 megawatt hydropower.
The Phetchabun Mountains are a double mountain range which runs in north-south direction, as most mountain ranges in Southeast Asia do. The western chain is called Khao-Lang-Non-Son and the eastern one bears the name Dong-Paya-Yen.
The highest peak lies in Phu Hin Rong Kla National Park in the western range. It's 1,794m high. Another high peak is Khao Kho (1,143m), roughly some 50km northwest of Phetchabun town. Two more national parks are Namtok Chat Trakan and Thung Salaeng Luan in the north.
Between the two ranges stretches the long valley in which Phetchabun town is located. More towns in the valley are Lom Sak, Nong Phai and Wichian Buri. Alltogether, the geographic ensemble is Phetchabun Province. The mountains are named after the city.
The Phetchabun Mountains are a natural barrier between central Thailand and the northeastern Khorat Plateau (Isan). The eastern range is prolonged by the Dong Paya Yen Mountains who blend into the Sankamphaeng Mountains and, to the east, into the Dangrek Mountain Range. It was always an obstacle for travellers, trade caravans as well as armies to cross the mountains between Siam (central Thailand) and the eastern territories of the Khorat Plateau, Cambodia and Laos. However, the favourable way was always that from Ayutthaya or Bangkok to Khorat as a first base in the east. Only in the late 19th century, with the construction of the Khorat Railway, the connection was established with the means of the industrial age.
The Phetchabun Mountains consist of limestone, together with sandstone and slate. Additionally there are portions of granite, basalt and porphyran.
About 130km south of Phetchabun town lies the historical area of Si Thep (also: Sri Thep, Sri Deva; nowadays Si Thep is also the southernmost district in Phetchabun Province). Si Thep Historical Park is a large ancient city surrounded by a wide moat and the remains of a city wall. A number of gates existed in the old times, of who now merely breakthroughs are left.
The place's history dates back to pre-historical times. Later, a city-state was established here supposedly in the 5th century CE. A variety of cultural influences who are traced here don't yet allow a clear classification. It may have been a foundation of the empire of Funan, which was later continued by it's successor, Chenla. Clearly, elements of the Dvaravati Culture are represented in Si Thep, which came under Khmer rule after the Angkorean conquests of central Thailand in the early 11th century. The Khmer gave the city it's last coinage, until it fell victim to the century-long wars between the uprising early Thai kingdoms of Sukhothai and Ayutthaya on one side and Angkor on the other from the 13th century on. Probably the city has been razed at least once by an enemy's army.
The here settling people were certainly of the Khmer/Mon group. Early immigrants and founders came maybe directly from India, either via Burma or from the coast of the Gulf of Thailand. Old sculptures who were found here show a style very close to Indian models. Both religions, Hinduism and Buddhism vere vibrant in Si Thep.
The historical place has been discovered by Siamese prince Damrong Rajanubhab in 1905. Archaeological research and excavations have been made by the Briton H.G. Quaritch Wales in 1935. Wales reconstructed the oval shape of the old city and explored the exact course of the old walls and the moat. A number of sculptures from the Dvaravati Culture and some of Hindu gods have been found; most of them are now in the National Museum of Bangkok. Of the more than hundred sites within the twin-city, only few have survived the test of time. Within the city walls were also dozens of ponds, of who most are spilt.