The Dead Sea is an intriguing natural water body mentioned in ancient inscriptions and manuscripts as a place possessing healing powers. Hence it is visited by people from all over the world. The Dead Sea is actually a salt lake that is surrounded by Jordon from the eastern side and the Western Bank and Israel from the west.
The Dead Sea from space.
Unparalleled Salinity
The Dead Sea is one of the saltiest water bodies, with 10 times more salt than normal seawater. The hot and dry weather evaporates large amounts of water, making salt and minerals highly concentrated. This is because water enters the Dead Sea from one of its main tributaries, the Jordon River.
The Dead Sea has a salinity of 34.2%, whereas the Mediterranean Sea has a salinity level of just 3.5%. However, some other smaller water bodies are even more saltier than the Dead Sea.
Map of the Dead Sea.
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Healing Qualities and Mineral Content
The Dead Sea contains beneficial minerals and salts, giving it powerful natural healing qualities. It has electrolytes like chloride and bromide and 26 other minerals in its water. Other medical conditions like arthritis, muscle ache and asthma can also be treated by the water of the Dead Sea.
Apart from the water, the black sea mud is also beneficial since it is small enough to penetrate the skin’s pores. A black mud facial can tighten skin pores, treat acne, reduce skin impurities, treat vitiligo and improve psoriasis.
Historical Significance
The healing waters of the Dead Sea have been sought after since Biblical times. The Masada National Park at the edge of the Judean desert in Israel is a UNESCO World Heritage Site today. The famous Cleopatra VII also visited this natural spa to enhance her beauty.
It was a famous trade route since Greco-Roman times, and ships regularly crossed its waters. For instance, before Israelis left Egypt in the Exodus, the Bible stated that people lived in caves around the Dead Sea.
Jericho is northwest of the Dead Sea, and the cities of Sodom and Gomorra were on its southwestern shores. One famous story mentioning the Dead Sea is the tale of Lot’s wife set in Sodom.
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Unique Experiences
People visit the Dead Sea to know how floating on the water’s surface feels. It is truly once in a lifetime experience. Swimming in the Dead Sea is almost impossible, and floating in its waters after exploring the top sights is quite relaxing.
However, it is still possible to drown in the Dead Sea if one is caught in strong winds and flips over, suddenly swallowing the salty water. Diving in the Dead Sea is something which only a few can try since it requires extraordinary skills.
Interestingly, one can stand on the Dead Sea banks in Jordon and view Israel’s West Bank and vice-versa.
Floating in the Dead Sea.
Lowest Point on Earth
Apart from being incredibly salty, the Dead Sea is also known for being the lowest point on Earth. Sunbathing on its shores has less risk of sunburn than in other locations. This is because it is below sea level, and harmful UV rays are filtered through the natural layers, an extra atmospheric layer, which is an evaporation layer above the Dead Sea and a thick ozone layer.
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Israel’s Highway 90 is the world’s lowest road running along the western shores of the Dead Sea. Another road, Jordan’s Highway 65, runs parallel to the eastern shores of the Dead Sea.
As of 2025, the lake's surface is 439.78 metres (1,443 ft) below sea level, making its shores the lowest land-based elevation on Earth. It is 304 m (997 ft) deep, the deepest hypersaline lake in the world.
Geological History
The Dead Sea was once part of the Mediterranean Sea. Around 3.7 million years ago, the region known as Jordon River Valley was flooded by Mediterranean Sea water that formed the Sedom Lagoon.
Nomenclature
The name Dead Sea came to be used in modern times, and ancient literature used different names for the water body, such as Bahr or Bahr or al-Bahr al-Mayyit in Arabic or Yām HaMāvet meaning ‘Sea of Death’ in Hebrew. The Hebrews used other names for the sea as well, like the Sea of Salt, the Sea of the Arabah, and the Eastern Sea.
Climate and Environment
The Dead Sea and its surrounding region have a hot desert-type climate with clear skies, low humidity, and low rainfall throughout the year. The aridity here is a result of the rainshadow effect of the Judaean Mountains. The low elevation of this place also makes for a thicker atmosphere that decreases the amount of ultraviolet radiation reaching the ground.
Due to high salinity, macroscopic life like fish and aquatic plants cannot survive in the Dead Sea; however, small amounts of bacteria and microbial fungi are found. In the rainy winters of 1980, the usually dark blue waters of the Dead Sea turned red due to the growth of algae called Dunaliella, causing the colour change.
Discovery of the Dead Sea Scrolls
Bedouin shepherds discovered the first 7 scrolls in jars at Qumran in 1946, eventually selling them to an antiquities dealer in Bethlehem. It is said that these scrolls were hidden during the Great Jewish Revolt to safeguard them from the Romans.
Tourism and Health
Israel has 15 hotels and resorts along the western shores of the Dead Sea, the oldest being opened in the 1960s. Psoriasis patients visit the Dead Sea to swim in its salty waters, providing some relief to their skin.
Economic Significance
Scientists recognised the economic viability of the Dead Sea’s rich potassium chloride reserves in 1911. Commercial operations began in 1931, and most of Britain’s potash supplies during the Second World War came from the Dead Sea. In the 1950s, they even began to harvest salt and shared the mineral harvests of bromide too.
Israel SUCKS MILLIONS OF TONS WATER FROM THE DEAD SEA -After 25 Years The RESULTS HORRIFY SCIENTISTS
Environmental Concerns
Per research data, the Dead Sea is shrinking at a rapid rate. Its surface level is dropping by more than one metre annually, and it’s only half the length of what it was just a century ago. This has happened because water from the Jordon River is diverted and also taken from the sea for nearby developments. Environmentalists do not support their plan since it may impact the Dead Sea ecosystem.
Unique Geological Phenomena
Another interesting feature of the Dead Sea is that it spits small pebbles and asphalt blocks from deep seeps found on its floor onto the surface.
Mixing of Red Sea and Dead Sea Waters
Mixing of Dead Sea water which is high in calcium (Ca ≥18 g/L) with Red Sea water that has high concentrations of sulfate (SO4−2 ≥ 3 g/L) would promote the natural formation of gypsum (CaSO4.2H2O) precipitate. Moreover, it was found that Halite (NaCl) began precipitating in 1983 as a consequence of increase in the Dead Sea water salinity and sustained constant precipitation rate since then.
Experimental Study on Water Mixing
This pilot project study used well-controlled mixed water ponds to investigate the interaction between Red Sea and Dead Sea waters. Experiments were conducted on the Dead Sea ground level. The experimental site was located next to Arab Potash Company point of intake about 100 m south of the Dead Sea shores.
Experimental Setup
Four tanks (1-4) were filled with an approximately 25 m3 of a mixture of Dead Sea and Red Sea waters. The source of the Dead Sea water was from the pipeline that feeds the evaporation ponds of the Arab Potash Company. Before mixing the two water bodies, large particles in the Red Sea water were removed by filtration through a filter.
Part of the filtered Red Sea water was concentrated by evaporation, in a water pool, to about twice its original salinity and mixed with the Dead Sea water in tank number 5 with the volume content shown in Table 1. Tank number 6 was filled only with Dead Sea water and used for benchmarking.
| Tank Number | Water Content |
|---|---|
| 1-4 | Mixture of Dead Sea and Red Sea waters |
| 5 | Dead Sea water mixed with concentrated Red Sea water |
| 6 | Dead Sea water only (benchmark) |
Table 1: Water Content in Experimental Tanks
Water Level Control
During the monitoring period water level controller is used to maintain the mixed water level in each tank at a fixed height. Red Sea water was added to the top of tanks 1-4, concentrated Red-Sea water was added to the top of tank 5, and tank 6 surface level was kept constact by adding Dead Sea water.
This water addition was done to compensate for water losses by evaporation. It was controlled by level control system, which consists of a float located at the mixed water-air interface, thus allowing more or less water to flow into each of the experimental tanks from the feed tanks.
No external force is applied to mix the waters in the tanks. The two waters are mixed by natural mass transfer between lighter and denser sea waters in a system of fixed volume that is affected by seasonal variations. Diffusion, natural convective mass transport, and the motion of the interface (between each tank water surface level and atmosphere) upon evaporation and dissolution were the main modes of mixing.
Sampling and Analysis
Water samples were collected from different water tanks (5 tanks of mixed waters and one tank of Dead Sea water only). During the winter, rain samples were collected as well. A collection time interval was adequate to monitor a variety of changes in salt concentration, temperature and rainfall.
As long as the experimental work lasted for one year, having a two weeks' time interval for sampling was enough to capture different occurring phenomena caused by mixing. Collected samples were kept away from light, even during transportation to the laboratory. Samples were stored in dark conditions at 4 °C.
All analyses were conducted, right after the samples being collected, in the laboratories of Prince Faisal Center for Dead Sea, Environmental and Energy Research (at Mutah University) and Arab Potash Company laboratories. The collected samples were analyzed and investigated for different physico-chemical parameters, salt types and microbial effects.
This paper discusses the results of physical properties measurement and analysis only, namely: temperature, pH, dissolved oxygen (DO), density, salinity, and viscosity.
Temperature Variation
It is well known that temperature contributes to all, mixed water, physical and chemical properties differences. The temperature changes depend on the climate conditions, highest temperatures were above 46 °C during the summer season, while during the winter season the temperature touched 17 °C.
Likewise, after six month from monitoring the temperature profile, the rejected brine tank-5 had a similar temperature behavior like the DS water tank-6 temperature variation. While, all other tanks showed temperatures higher than either the DS water tank (tank-6) or the rejected brine tank (tank-5). The results of temperature profile explain the proportionality relationship between the water temperature and density.
Acidity (pH) Variation
The water acidity which can be expressed by the pH value plays a vital role for the aquatic life. Most of marine organisms live in a pH range of 6.5-9.0, though some of them can live in ocean water with pH levels outside of this range. Therefore, pH value was monitored during the study period in the mixing water tanks.
Additionally, the water acidity controls the trace metals solubility and mixed water toxicity. It was observed that the water acidity decreases with the increase in water temperature during the last 6 months of the experiments. But, the mixed waters solution became more acidic due to an excess of hydrogen ions over hydroxide ions.
Dissolved Oxygen
Both dissolved oxygen and temperature of the mixed water bodies are affected by seasonal weather variations and the physical properties of mixed water. It is clear that the concentration of dissolved oxygen throughout the year is too low (less than 0.004 g/l), that makes it impossible to sustain aquatic life at the bottoms of all tanks.
Some reasons for the low DO level could be chemical and biological oxygen demands. It was found that mixed water in all tanks except tank number 6 was stratified, which means that the hypolimnion receives little oxygen from atmospheric diffusion.
Moreover, continuous feed streams come from feeding tanks and have only minimal impacts on the oxygen content of larger mixing tanks. Thus, the mixed water at the bottom of the tanks receives very little dissolved oxygen during summer thermal stratification but a little more during the winter time.
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