Chogha Zanbil, also known as Dur-Untash, is an ancient Elamite complex located in the Khuzestan province of southwestern Iran. The site dates back to the Middle Elamite period of Iran, between 1250 BCE and 650 BCE, and was built by the Elamite king Untash-Napirisha.

The complex includes a large ziggurat, or stepped pyramid, as well as a series of temples and palaces. The ziggurat was originally about 52 meters (170 feet) tall, with five levels, and was constructed using over 2 million baked bricks. The other buildings at the site were also constructed using baked bricks, and some of the walls are decorated with colorful glazed bricks.

Chogha Zanbil was abandoned after being sacked by the Assyrian king Ashurbanipal in the 7th century BCE, and was not rediscovered until the early 20th century. It was declared a UNESCO World Heritage Site in 1979, and is considered one of the best-preserved examples of Elamite architecture and art.