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Sediments Around Kerkennah Islands, Tunisia

34.6N 11.0E

February 5th, 2013 Category: Sediments

Tunisia – February 2nd, 2013

Most reliable models of climatic observation and forecast show that the south of the Mediterranean perimeter is threatened by important variations of environmental conditions. In parts of the Kerkennah archipelago, which is visible here off the coast of Tunisia, ringed by bright green and brown sediments, changing marine conditions and overfishing have caused a decrease in fish quantity and favoring of agriculture over fishing. There has also been an enlargement of sebkhas (low, salty lands that are liable to flooding hazards) that might likely be caused by climatic and environmental evolution like sea level rise and subsidence, making such areas more vulnerable to sea surges (click here to read more).

Djerba and Kerkennah Islands by Tunisia

33.8N 10.8E

July 10th, 2011 Category: Deserts, Salt Flats

Tunisia - July 4th, 2011

Visible off the coast of Tunisia in this image are the Kerkennah Islands (top right corner), an archipelago with an area of 160 km2, and Djerba (south of the former), the largest island of North Africa at 514 km², located in the Gulf of Gabes, off the coast of Tunisia.

Moving inland, west of Djerba, is the Chott el Djerid, a large endorheic salt lake in southern Tunisia. It is the largest salt pan of the Sahara Desert. South of this salt pan is the Grand Erg Oriental, a large sand dune sea.

Kerkennah Islands and Djerba Off Tunisian Coast

December 28th, 2009 Category: Snapshots

Tunisia - December 16th, 2009

Tunisia - December 16th, 2009

Both the Kerkennah Islands (above) and the island of Djerba (below) are surrounded by greenish tan waters. This coloration may be partially caused by sediments and partially caused by algal growth, as two species of green algae tend to invade this coastal region.

The Kerkennah Islands are a group of islands lying off the east coast of Tunisia in the Gulf of Gabes. The islands are low-lying, at no more than 13 metres above sea level. The archipelago has an area of 160 km2 and a population of 14,400 as of 2006. Djerba, also located in the Gulf of Gabes, is the largest island off North Africa at 514 km². Its largest city is Houmt-Souk, with a population of around 60,000.

Green Waters Around Djerba and the Kerkennah Islands, Tunisia

33.8N 10.8E

November 13th, 2009 Category: Snapshots

Tunisia - September 24th, 2009

Tunisia - September 24th, 2009

The water around the shores of eastern mainland Tunisia, the island of Djerba (below) and the Kerkennah Islands (above), and in the Gulf of Gabès (center left) and Gulf of  Boughrara (below Djerba) show various shades of green, ranging from light and bluish to dark and brownish.

Some of the dark green color may be caused by two species of green algae that have a tendency of invading the coast of Tunisia and are often found around the Kerkennah Islands.

Algal Growth Around Kerkennah Islands, Tunisia

34.7N 11.0E

September 4th, 2009 Category: Snapshots

Tunisia - July 26th, 2009

Tunisia - July 26th, 2009

The shorelines of the eastern coast of mainland Tunisia, the island of Djerba (below center) and the Kerkennah Islands (top center) appear very sharp in contrast with the dark waters of the Gulf of Gabès (left) and the Mediterranean Sea.

Upon closer examination, the dark blue sea waters also appear to contain some dark green algae, particularly around the Kerkennah islands and along the coast east of Djerba.

Two species of the green algae are considered as invasive in Tunisia and are found in many places along the central and southern Tunisian coast, and even in the North of the country in colder water. These species are frequently encountered around the Kerkennah Islands.

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