The Cottonera Lines, also known as the Valperga Lines, are a line of fortification in Cospicua and Birgu, Malta. They were built in the 17th and 18th centuries to form the outer defences of the Three Cities of Birgu, Senglea and Cospicua. They surrounded an earlier line of fortifications, known as the Santa Margherita Lines.
Latitude: 35° 52' 22.19" N
Longitude: 14° 31' 11.39" E