| Cottonera Lines | |
|---|---|
Is-Swar tal-Kottonera | |
| Cospicua and Birgu, Malta | |
 The Cottonera Lines as seen from Għajn Dwieli | |
 Map of the Cottonera Lines and the Santa Margherita Lines. The Cottonera Lines are the outer line of fortifications. | |
| Coordinates | 35°52′37.4″N 14°31′36.2″E / 35.877056°N 14.526722°E |
| Type | Line of fortifications |
| Site information | |
| Owner | Government of Malta Various private owners |
| Condition | Mostly intact |
| Site history | |
| Built | 1670–1760s |
| Built by | Order of Saint John |
| In use | 17th–20th centuries |
| Materials | Limestone |
| Battles/wars | Siege of Malta (1798–1800) |
The Cottonera Lines (Maltese: Is-Swar tal-Kottonera), also known as the Valperga Lines (Maltese: Is-Swar ta' Valperga), are a line of fortifications in Bormla and Birgu, Malta. They were built in the 17th and 18th centuries on higher ground and further outwards than the earlier line of fortifications, known as the Santa Margherita or Firenzuola lines, which also surround Bormla.