Joint tombs of boat-shaped coffins
The joint tombs of boat-shaped coffins () are tombs of the ancient Shu state discovered in Chengdu, Sichuan, China, dating to the Spring and Autumn period (770–476 BC) and the Warring States period (476–221 BC). and apparently also occurred during the Qin dynasty (221–206BC). These tombs of boat-shaped coffins are on UNESCO's list of tentative world heritage sites together with Sanxingdui and Jinsha site. Discoveries. In 2000, a number of boat-shaped coffins were found at a tomb site in central Chengdu. This tomb is believed to be royal from the former  kingdom of Shu in Warring States period. The tomb measure 30.5 × 20.3m and has a depth of 2.5m. The tomb contains a total of 17 coffins and is dated 400BC. The biggest boat-shaped coffin is 18.8m long and 1.5m wide and contains a large number of cultural objects. In early 2017, nearly 200 tombs with boat-shaped coffins were found in an area as big as two football pitches in the village of "Shuangyuan" in Dawang in Qingbaijiang district outside Chengdu. Numerous bronze artifacts were uncovered in the tombs. In 2018, it was announced  that tombs with 60 boat-shaped coffins placed in four rows were found in the village Pujiang County in Sichuan. In the tombs more than 300 artefacts of ceramics, bronze, iron, and bamboo were unearthed. Also, weapons, coins, and glass pearls have been excavated. The pearls were likely to be imported through the Silk Road. The discoveries are dated to the Warring States period and the Qin dynasty (221–206BC).