Lyonesse was constructed using a biologically-constructed matrix, which was bulked-out using silt dredged from the sea-floor
Artificial island built in the English Channel as a Free State, established in 78 A.T.. A centre for research into artificial intelligence and measures against anthropogenic global warming. Like most such islands, Lyonesse gradually increased in surface area over time, and it was nearly a thousand square kilometers in extent by the end of the Interplanetary Age.