Ain ez Zarqa (also spelled Ayn ez Zarqa or Ain-el-Zerqa) is a natural artesian

karst spring A karst spring or karstic spring is a spring (outflow of groundwater) that is part of a karst hydrological system. Description Because of their often conical or inverted bowl shape, karst springs are also known in German-speaking lands as a ''T ...

located south of

Hermel Hermel ( ar, الهرمل) is a town in Baalbek-Hermel Governorate, Lebanon. It is the capital of Hermel District. Hermel is home to a Lebanese Red Cross First Aid Center. Hermel's inhabitants are predominantly Shia Muslims. There is an ancie ...

in the

Beqaa Governorate Beqaa ( ') is a governorate in Lebanon. Districts Since 2014, Beqaa Governorate contains three districts: * West Beqaa * Rashaya * Zahle A law was passed in 2003 to separate Baalbek District and Hermel District from Beqaa Governorate to form a ...

Lebanon Lebanon ( , ar, لُبْنَان, translit=lubnān, ), officially the Republic of Lebanon () or the Lebanese Republic, is a country in Western Asia. It is located between Syria to Lebanon–Syria border, the north and east and Israel to Blue ...

. Producing an average of 3,435 gallons per second, it is the main source of the Orontes River. Because of its heavy flow, it is characterized as a first-magnitude spring. It sits beneath the caves at

Deir Mar Maroun The Monastery of Saint Maron (Syriac: ''Deir Mar Maroun''), also called the Cave of the monks, is an ancient cavern initially developed as a refuge structure by the Romans and later used as a Maronite monastery and carved out of solid rock in the ...

, an ancient monastery carved into the cliffs that surround the spring. Melting snow from these nearby heights supplements the spring's large

groundwater Groundwater is the water present beneath Earth's surface in rock and soil pore spaces and in the fractures of rock formations. About 30 percent of all readily available freshwater in the world is groundwater. A unit of rock or an unconsolidated ...

reservoir, in the

Jurassic The Jurassic ( ) is a geologic period and stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The Jurassic constitutes the middle period of ...

and

Cretaceous The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of ...

strata. It is estimated that the spring's

phreatic zone The phreatic zone, saturated zone, or zone of saturation, is the part of an aquifer, below the water table, in which relatively all pores and fractures are saturated with water. Above the water table is the unsaturated or vadose zone The v ...

reservoir contains as much as 10 billion cubic metres of storage. As a result, its flow has been less affected by overpumping and drought than other springs in the Orontes river basin.

References

Karst springs Springs of Lebanon {{Lebanon-geo-stub