Your question is in the present tense ("What is . . .") and since it no longer exists the answer is it has no size.
If you mean "What was the size of the Pharos at Alexandria?", it was estimated (not measured) at between 393 and 450 feet tall, with a lower section about 28 feet square, rising in gradually smaller sections. It stood on a platform at least 21 feet tall.
Since it no longer exists we can only rely on descriptions written by people who saw it in use in ancient and medieval times.
The height is estimated at 120 to 140 metres (around 400 to 450 feet) and the tower was about 8.5 metres (28 feet) square, built on a large platform 6.5 metres (21 feet) high.
between 390 and 450 feet tall, it was the tallest man made structure on Earth for many centuries
Between 120 and 140 meters
The lighthouse at Alexandria was also known as Pharos.
the lighthouse of Alexandria was made to direct ships away from the shore or to the shore
There were two earthquakes that had a direct impact on the Lighthouse of Alexandria.
The Lighthouse of Alexandria was built in ALexandria, Egypt around 250BC. The Lighthouse destroyed by a series of earthquakes over several centuries, until in 1480AD even the concrete base was no longer able to be found.
africa
The lighthouse at Alexandria was also known as Pharos.
the oldest lighthouse is the lighthouse of Alexandria
about 2,350 people built the lighthouse of alexandria
The Lighthouse of Alexandria was in Alexandria, Egypt. It was located on the African continent.
It is an old lighthouse
Lighthouse of Alexandria .
the lighthouse of Alexandria was made to direct ships away from the shore or to the shore
It is believed that, not only was the lighthouse at Alexandria the tallest lighthouse in the world for its time, but no lighthouse constructed since then has equalled it in height.
why not -Bilbo Swaggins
The Lighthouse of Alexandria .
The Lighthouse of Alexandria was built between 280 and 247 BC.
The lighthouse of Alexandria collapsed in the 1300s, in the fourteenth century. To be specific, it was 1326.