 Mesopotamian artifacts originating from the Ubaid period (c. 6500–3800 BC) have been discovered in abandoned coastal settlements.Al Da'asa, a settlement located on the western coast of Qatar, is the most important Ubaid site in the country and is believed to have accommodated a small seasonal encampment.Kassite Babylonian material dating back to the second millennium BC found in Al Khor Islands attests to trade relations between the inhabitants of Qatar and the Kassites in modern-day Bahrain.