While the area around the harbour was developed over the following centuries, there was little development of the Mgarr harbour itself until 1841, when a breakwater was constructed to provide more shelter to the port. This breakwater was strengthened and extended several times up to 1906. A larger breakwater was constructed between 1929 and 1935, and two more in 1969; on the completion of the latter, the area of the port was expanded to 121,400 square metres.
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