Where was an early true arch made from sun-baked brick?

The first true arch made of sun-baked brick was constructed in the ancient city of Ur, located in Mesopotamia (modern-day Iraq), around 4000 BCE.1

While the original arch itself has not survived, historical records indicate that it utilized a bitumen slime as mortar to bind the bricks together. It is important to note that while this early example is attributed to sun-baked brick, the first surviving true arches in brick were later found in the roofs of underground drains, which utilized fired bricks.12