Cambodia (; , or Kampuchea ), officially known as the Kingdom of Cambodia (, "Preăh Réachéanachâk Kâmpŭchéa", ), is a country located in the southern portion of the Indochina Peninsula in Southeast Asia. It is in area, bordered by Thailand to the northwest, Laos to the northeast, Vietnam to the east, and the Gulf of Thailand to the southwest. 

Cambodia has a population of over floor(/1e6) million. The official religion is Theravada Buddhism, practiced by approximately 95 percent of the population. The country's minority groups include Vietnamese, Chinese, Chams, and 30 hill tribes. The capital and largest city is Phnom Penh, the political, economic, and cultural centre of Cambodia. The kingdom is a constitutional monarchy with Norodom Sihamoni, a monarch chosen by the Royal Throne Council, as head of state. The head of government is Hun Sen, who is currently the longest serving non-royal leader in South East Asia and has ruled Cambodia for over 30 years. 

In 802 AD, Jayavarman II declared himself king, uniting the warring Khmer princes of Chenla under the name "Kambuja". This marked the beginning of the Khmer Empire which flourished for over 600 years, allowing successive kings to control and exert influence over much of Southeast Asia and accumulate immense power and wealth. The Indianized kingdom built monumental temples including Angkor Wat, now a World Heritage Site, and facilitated the spread of first Hinduism, then Buddhism to much of Southeast Asia. After the fall of Angkor to Ayutthaya in the 15th century, a reduced and weakened Cambodia was then ruled as a vassal state by its neighbours. In 1863 Cambodia became a protectorate of France which doubled the size of the country by reclaiming the north and west from Thailand.
name the world heritage site in Cambodia.
when did Jayavarman declare himself king?
what is Cambodia's official name?
are there hill tribes there?
how many?
how many other minorities?
which ones?
who is head of government?
is he royal?
has he ruled for long?
how long?
where is this country located?
who doubled the size?
how?
does Vietname border it on the North?
which country borders it on the Northeast?
what is in the southwest?
who did Jayavarman unite?
who ruled for 600 years?
is Angkor Wat a temple or a train service?
Angkor Wat, now a World Heritage Site,
The Indianized kingdom built monumental temples including Angkor Wat, now a World Heritage Site,
802 AD
In 802 AD, Jayavarman II declared himself king
Kingdom of Cambodia
Cambodia (; , or Kampuchea ), officially known as the Kingdom of Cambodia 
yes
 The country's minority groups include Vietnamese, Chinese, Chams, and 30 hill tribes.
30
 The country's minority groups include Vietnamese, Chinese, Chams, and 30 hill tribes.
Three
The country's minority groups include Vietnamese, Chinese, Chams, and 30 hill tribes.
Vietnamese, Chinese, Chams
The country's minority groups include Vietnamese, Chinese, Chams, and 30 hill tribes.
Hun Sen
The head of government is Hun Sen, who is currently the longest serving non-royal leader in South East Asia and has ruled Cambodia for over 30 years.
no
 The head of government is Hun Sen, who is currently the longest serving non-royal leader in South East Asia and has ruled Cambodia for over 30 years. 
yes
The head of government is Hun Sen, who is currently the longest serving non-royal leader in South East Asia and has ruled Cambodia for over 30 years. 
over 30 years
The head of government is Hun Sen, who is currently the longest serving non-royal leader in South East Asia and has ruled Cambodia for over 30 years. 
southeast Asia
Cambodia (; , or Kampuchea ), officially known as the Kingdom of Cambodia (, "Preăh Réachéanachâk Kâmpŭchéa", ), is a country located in the southern portion of the Indochina Peninsula in Southeast Asia.
France
 In 1863 Cambodia became a protectorate of France which doubled the size of the country by reclaiming the north and west from Thailand.
by reclaiming the north and west from Thailand
 In 1863 Cambodia became a protectorate of France which doubled the size of the country by reclaiming the north and west from Thailand.
yes
 It is in area, bordered by Thailand to the northwest, Laos to the northeast, Vietnam to the east, and the Gulf of Thailand to the southwest. 
Laos
 It is in area, bordered by Thailand to the northwest, Laos to the northeast, Vietnam to the east, and the Gulf of Thailand to the southwest. 
the Gulf of Thailand
It is in area, bordered by Thailand to the northwest, Laos to the northeast, Vietnam to the east, and the Gulf of Thailand to the southwest. 

Khmer princes of Chenla
In 802 AD, Jayavarman II declared himself king, uniting the warring Khmer princes of Chenla under the name "Kambuja"
Khmer Empire
 This marked the beginning of the Khmer Empire which flourished for over 600 years
a temple
The Indianized kingdom built monumental temples including Angkor Wat, now a World Heritage Site,