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St. John's Island (also known as Zagbargad, Zebirget, Topazios) is the largest of a group of islands in Foul Bay, Red Sea in Southern Egypt. It covers an area of 4.50 square kilometres (approx.). It is a quaternary volcanic island. The nearest island is Rocky Island which are linked by corals. The island is slightly north of the Tropic of Cancer. The highest point on the island is 235 metres.

Geology

The island is considered geologically unique as it is uplifted mantle, a fragment of the sub-Red Sea lithosphere. Rocks on the island are mainly lower crustal metamorphic rocks. The island became present above sea level after African and Asiatic continental plates converged to cause rocks in the lower crust to be uplifted. The island is compiled mainly of the gem peridot. This gem makes the island notable as it is believed to be the first discovered source of peridot. This abundance has led to beliefs that the Greek name for the island, Topazios was derived from topaz. Layers of spinel-lherzolites with anhydrous Al-diopside pyroxenites and hydrous Cr-diopside pyroxenites can be found too on the island. The presence of all of these minerals has led to mining on the island which dates back as early as the 19th century.

Nature

The island is part of the Elba National Park meaning the island is conserved. However, the island was closed to the public for one year due to damage to corals and the disturbance of birds who breed on the island.

Birds

The island serves as a breeding ground for at least 9 known species of birds. The most recent discovery was that of 150 pairs of Falco concolor (Sooty Falcon in October, 1994.

Plantlife

Vegetation on St. John's Island is very hard to find. Due to the island's lack of soil and infertile rocks, plants have nowhere to grow.

Corals & sealife

The corals surround the island and act as a barrier for the fish and other sea life which live among it. However, the corals recently became damaged due to increased tourist activity and the expansion of the diving industry on the island. The coral is located approximately 25 metres below the surface

Fish that can be found within the nearby waters and corals are:

Tourism

The island is located near coral reefs which serve as a popular diving attraction for tourists. The diving industry on the island has increased as well as the tourism industry on the island in general resulting in the construction of hotels and diving shelfs. The beaches are often quiet and are relatively unspoilt by development. However, most tourists go to this island as a "stop-off" before going to Rocky Island in the south.

External links

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 ==Geology==
-The island is considered [[geology|geologically]] unique as it is uplifted [[Mantle (geology)|mantle]], a fragment of the sub-[[Red Sea]] [[lithosphere]]. Rocks on the island are mainly lower [[crust]]al [[metamorphic]] rocks. The island became present above sea level after [[Africa]]n and [[Asia]]tic continental plates converged to cause rocks in the lower crust to be uplifted. The island is compiled mainly of the [[gem]] [[Peridot]]. This gem makes the island notable as it is believed to be the first discovered source of [[Peridot]]. This abundance has led to beliefs that the [[Greece|Greek]] name for the island, ''Topazios'' was derived from [[topaz]]. Layers of [[spinel-lherzolites]] with [[anhydrous]] [[Al-diopside pyroxenite]]s and [[hydrous]] [[Cr-diopside pyroxenite]]s can be found too on the island. The presence of all this minerals has lead to mining on the island which date back as early as the 19th century.
+The island is considered [[geology|geologically]] unique as it is uplifted [[Mantle (geology)|mantle]], a fragment of the sub-[[Red Sea]] [[lithosphere]]. Rocks on the island are mainly lower [[crust]]al [[metamorphic]] rocks. The island became present above sea level after [[Africa]]n and [[Asia]]tic continental plates converged to cause rocks in the lower crust to be uplifted. The island is compiled mainly of the [[gem]] [[peridot]]. This gem makes the island notable as it is believed to be the first discovered source of [[peridot]]. This abundance has led to beliefs that the [[Greece|Greek]] name for the island, ''Topazios'' was derived from [[topaz]]. Layers of [[spinel-lherzolites]] with [[anhydrous]] [[Al-diopside pyroxenite]]s and [[hydrous]] [[Cr-diopside pyroxenite]]s can be found too on the island. The presence of all of these minerals has led to mining on the island which dates back as early as the 19th century.
 ==Nature==