Piombino is a town and commune in the province of Livorno ( Tuscany ) , Italy , on the border between the Ligurian Sea and the Tyrrhenian Sea , in front of Elba Island and at the northern side of Maremma . Piombino is an Italian town and comune of circa 35,000 inhabitants in the province of Livorno ( Tuscany ) . It lies on the border between the Ligurian Sea and the Tyrrhenian Sea , in front of Elba Island and at the northern side of Maremma .