The Republic of Palau is an island country in the western Pacific, in free association with the United States. In one way or another, the country has been under US administration since it was established, and has never had its own separate currency - it has always used the US Dollar. However, Palau allows some foreign mints to issue coins under its authority; these are denominated in US Dollars but are only legal tender in Palau, so can in a way be considered to be in "Palau Dollars", even though such a currency does not officially exist.
The coins are usually dedicated to historical or general popular culture themes not related to the country itself. Many of them are in standard bullion sizes, including the large five troy ounces (5oz) of silver format.
The Mint says about this coin:
The Babylon Civilisation 5oz coin is the big brother of the 2oz first issue in the Lost Civilisations series.
The city of Babylon was the capital of Babylonia, a kingdom in ancient Mesopotamia. The city was founded more than 4,000 years ago along both banks of the Euphrates river, whose ruins are located in present-day Iraq. King Hammurabi created one of the ancient world’s largest cities during the 18th century BC. After being destroyed, Babylon became the Neo-Babylonian Empire’s capital that spanned from the Persian Gulf to the Mediterranean Sea. Art and architecture flourished throughout the Babylonian Empire, especially in Babylon, which is also famous for its impenetrable walls and blue tiled Ishtar Gate.