Tumulus culture
The Nordic Bronze Age maintained intimate trade links with the Tumulus culture and Mycenaean Greece. The Nordic Bronze Age exported amber through the Amber Road, and imported metals in return. During the time of the Nordic Bronze Age, metals, such as copper, tin and gold, were imported into Scandinavia on a massive scale. Copper was imported from Sardinia and Iberia. The trade network was briefly disrupted during the Late Bronze Age collapse in the 12th century BC.