The largest island near Greece is Crete, it lies to the south east of Greece in the Mediterranean Sea
That would be Crete.
Crete
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The largest island near Greece is Crete, it lies to the south east of Greece in the Mediterranean Sea
There are a number of islands just northeast of Crete, including Dragonada, Karpathos, Kos and Rhodes.
The largest sand island in the world is Fraser Island. It lies off the coast of the State of Queensland, Australia. Its area is 184,000 hectares (454,000 acres).
New Zealand's largest lake is Lake Taupo in the North Island. Lake Te Anau is the South Island's largest lake, and has a town of that name on its shore.
The sea that lies west of Greece is the Ionian the sea that lies south of Greece is the Mediterranean and the sea that lies east of Greece is the Aegean.
The literal answer to your question is Madagascar, a very large island off the coast of Africa which is about 3500 miles south (and 1100 miles to the east) of Greece. It is the largest island located south of Greece. I suspect, however, that what you are asking for the name of the largest of the Greek islands to the south of mainland Greece: that large island in the very south of Greece is Crete.
There is no notably large island southwest of Africa, however, there is Madagascar to the southeast.
Fraser Island is the world's largest sand island. It is over 123 kilometres in length and 22 kilometres at its widest point, and has an area of 184 000 hectares. The Great Sandy Strait separates Fraser Island from the mainland.
Greenland is the largest island in the world
The largest island is called Honshu.
Great Britain is the largest island in Europe.
The largest Greek island by area is Crete.