Phnom Dei (Khmer: ភ្នំដី [pʰnom ɗəj]) is a 272 m high hill close to Siem Reap, Cambodia.

It is part of the temple complex in Angkor, the area that was the capital of the Khmer Empire.

There is a temple on top of the hill that was built during the reign of King Yasovarman I (889-910 AD).

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