What is the capital of Cambodia?

The capital city of Cambodia is Phnom Penh.
Phnom Penh is once known as the "Pearl of Asia," this is Cambodia's economic, political, industrial, and cultural center making it the nation's wealthiest and most populous city. It is located at the confluence of three rivers, the Mekong River, the Basaac River, and the Tonle Sap. It is the wealthiest and most populous city in Cambodia. The city is known to have the most beautiful and historical architectures in the country. This includes the Royal Palace, the Silver Pagoda, the National Museum, the Toul Sleng Genocide Museum, and Wat Phnom.
Referrence: travel-tourist-information-guide.com/cambodia-phnom-penh

Phnom Penh is the capital and most populous city of Cambodia.