Which country does Phnom Penh belong to?

According to Wikipedia, Phnom Penh belongs to Cambodia. The Kingdom of Cambodia, referred to as Cambodia for short, is located in Indochina Peninsula, bordering Thailand in the west and northwest, Laos in the northeast, Vietnam in the east and southeast, and the Gulf of Thailand in the south. In the capital Phnom Penh, Khmer people account for 80% of the total population. Cambodia, known as Khmer in ancient times, is an ancient civilization with a long history. As early as 1 century, a unified kingdom was established. The Angkor Dynasty from the 9th century to14th century was the most glorious era in Cambodian history.