Introduction to the jade urn: Also known as "Dushan Jade Sea", it was made in the second year of Zhiyuan (1265). The mouth is oval in shape, with a height of 70 centimeters, a circumference of 493 centimeters, and a weight of about 3,500 kilograms. The whole body is embossed with reliefs of sea dragons, seahorses, sea pigs, sea rhinoceros, etc. appearing in the waves, which are lifelike. It is a rare jade carving of the Yuan Dynasty.