1946, January 01 – Only Non-Professionals to Have Won Acting Oscars
World War II veteran Harold Russell (Canada) who played the handless ex-soldier (Russell had both his arms blown off in combat) in The Best Years of Our Lives (USA 1946) and Cambodian refugee Dr Haing S. Ngor who played a victim of Cambodia's Pol Pot regime in The Killing Fields (UK 1984), both received Best Supporting Actor Oscars for their performance. - Netdata
Largest Religious Structure
The largest religious structure ever built is Angkor Wat (City Temple), enclosing 162.6 ha (401 acres) in Cambodia. It was built to the Hindu god Vishnu by the Khmer King Suryavarman II in the period 1113–50. Its curtain wall measures 1,280 m (4,200 ft), and its population, before it was abandoned in 1432, was 80,000. The temple forms part of a complex of 72 major monuments, begun c. AD900, that extends over 24.8 km (15.4 miles). Area in m²/ft² is 1,626,000 m² (17,502,118.31 ft²). – Guinness World Records
1993, January 01 – Most State Roles Held by a Modern Royal
King Norodom Sihanouk of Cambodia was king fom 1941 to 1955, prime minister from 1955 to 1966, head of state and regent from 1960 to 1970, head of the government-in-exile in 1970, president in 1976, president-in-exile from 1982 to 1988, head of the government-in-exile from 1989 to 1991, president of the National Council in 1991 and head of state from 1991 to 1993. In 1993 he was restored as king. – Guinness World Records
2011 – Widest Rapids (Cambodia Mekong River)
During monsoon season, the Mekong River on the border between Cambodia and Laos increases in volume by a factor of 20, flooding the Si Phan Don wetlands and creating an area of turbulent rapids 11-14 km (7-8.5 miles) wide. The flow rate here is twice that of Niagara Falls, with 10 million litres metres of water thundering its way through a maze of channels between the area's many islands every second.
Laziest Freshwater Turtle
Native to the Mekong River in Cambodia, Cantor's giant soft-shelled turtle (Pelochelys cantorii) spends 95% of its life motionless in sand on the river bottom waiting for prey to approach. It comes up to the water surface to breathe air only twice each day.
The Longest Alphabet
The language with the most letters is Khmer (Cambodian), with 74 (including some without any current use).
2015, April 14 – Largest Sticky Rice Cake (Num Ansorm)
The largest sticky rice cake (Num Ansorm) weighs 4,040 kg (8,906 lb 10 oz) and was achieved by Salakhet Siem Reap (Cambodia), in Siem Reap, Cambodia on 13 April 2015. The record attempt was organised to celebrate the Cambodian New Year 2015. – Guinness World Records
2015, April 15- Largest Madison Dance
The largest Madison dance involved 2,015 participants and was achieved by the Union of Youth Federations of Cambodia (Cambodia), in Siem Reap, Cambodia on 15 April 2015. The record attempt was organised to celebrate the Cambodian New Year 2015. – Guinness World Records