A guest article supplied by Graham Salisbury
They are mystical stones, and of medicinal virtue. The giants of old brought them from the farthest coasts of Africa, and placed them in Ireland, while they inhabited that country. (Geoffrey of Monmouth, The British History of, translated from the Latin by A. Thompson and J. A. Giles, James Bohn, London, 1842, p.158 [Bk 8, Ch. 11].)
I am indebted to Robert Temple for the bulk of the information contained in this article and the majority of the illustrations used appear on his website at http://www.egyptiandawn.info.
In a seldom visited and uninviting part of Morocco, not far from the Atlantic coast, away from major tourist attractions and decent roads lies a remarkable and enigmatic megalithic site.

Figure 1: Old Print of Mzora from 1830 by Arthur de Capell Brooke from http://www.egyptiandawn.info/chapter8.html
The Mzora stone ring (also spelled variously Msoura/Mezorah) is situated roughly 11km from the nearest town of Asilah and about 27km from the fascinating, overgrown ruins of ancient Lixus. It is not easy to reach and guide books to the area are of only very limited use (for a detailed discussion of its precise location including GPS co-ordinates see http://lostcities.weebly.com/1/post/2011/01/re-discovery-of-moroccan-megalithic-stone-circle.html). A small display in the archaeological museum at Tetouan is the most the majority of visitors see or hear of this extraordinary place.
Mzora is largely absent from the historical record but Plutarch, in the first century A.D., may have referred to Mzora in his Life of Sertorius. He describes the Roman General Quintus Sertorius being told by local inhabitants about a site they knew as the tomb of the giant Antaeus who had been killed by Hercules. There are many other ancient accounts that place the tomb of Antaeus in close proximity to both Lixus and Tangier and it is quite plausible that Mzora is the inspiration behind these stories. (Temple, Robert (2010). Egyptian Dawn. London: Century. P386-7).
The site itself is a Neolithic ellipse of 168 surviving stones of the 175 originally believed to have existed. The tallest of these stones is over 5m in height. The ellipse has a major axis of 59.29 metres and a minor axis of 56.18 metres. At the centre of the ring, and quite probably a much later addition, is a large tumulus (the tomb of Antaeus?). Not much remains of this tumulus today, the bulk of the damage to it seems to have been done by excavations undertaken in 1935-6 by C├ęsar Luis de Montalban. It was he who cut across the mound in two intersecting trenches leaving the distinctive ‘X’ shaped scar visible today (Temple, Robert (2010). Egyptian Dawn. London: Century. p378).

Figure 2: Aerial view of Mzora Stone Circle from Google Earth
The only professional survey of the site was conducted in the 1970s by James Watt Mavor, Junior of the Woods Hole Oceanographic Institute in Massachusetts, USA. It is this survey that revealed Mzora to be not only remarkable in its own right but to have implications for the history of megalithic sites in Britain.

Figure 3: Mavor Survey and Aerial photo comparison
As hinted at by Geoffrey of Monmouth above, Mzora, incredibly, appears to have been constructed either by the same culture that erected the megalithic sites in France, Britain and Ireland or by one that was intimately connected with them. The ellipse is constructed using a Pythagorean right angled triangle of the ratio 12, 35, 37. This same technique was used in the construction of British stone ellipses of which 30 good examples survive including the Sands of Forvie and Daviot rings.
Of the use of Pythagorean triangles in British sites Professor Alexander Thom remarked:
“The remarkable thing is that the largest, the 12, 35, 37, was known and exploited more than any other with the exception of the 3, 4, 5.” Thom, Alexander (1967). Megalithic Sites in Britain. Oxford: OUP. p.27.

Figure 4: Mavor Survey Ellipse from http://www.egyptiandawn.info/chapter8.html
Furthermore it appears that the same unit of measure, the megalithic yard (or something remarkably close) used in the construction of the British sites surveyed by Thom, was also used in the construction of Mzora:
“If a ‘megalithic yard’ of 0.836 metres … [is used] … then the major axis and the perimeter of the ring take on values nearly integral.”Temple, Robert (2010). Egyptian Dawn. London: Century. p379.
Thom proposed that achieving a circumference measured in whole numbers was of paramount importance to the builders of megalithic rings:
“When Megalithic man set out a circle with a diameter of 8 units he found the circumference very nearly 25 units but in general he could not get nice whole numbers like these for both the diameter and the circumference simultaneously. Probably the attraction of the ellipse, and we know of over 30 set out by these people, was that it […] was easier to get the circumference near to some desired value.” Thom, Alexander (1967). Megalithic Sites in Britain. Oxford: OUP. p.31.
Mzora isn’t the only stone circle in Africa to share its construction methodology with British sites. The Nabta Playa stone ring in Southern Egypt conforms to Alexander Thom’s “Type I egg” geometry.
But there are further wonders. According to the diagram below by James Watt Mavor the following astronomical phenomena are marked by the circle:
Stone 30 marks the summer solstice sunrise.
Stone 146 marks the summer solstice sunset.
Stones 61 and 62 mark the winter solstice sunrise.
Stone 118 marks the winter solstice sunset.
Stone 47 marks the equinoctial sunrise
Stone 132 marks the equinoctial sunset
Temple, Robert (2010). Egyptian Dawn. London: Century. p391.

Figure 5: Mavor Survey Stone Numbers from http://www.egyptiandawn.info/chapter8.html
In Mzora we have a fascinating and important site that challenges many assumptions about stone circles in Britain as well as raising a great many more questions. At present the site is unmanaged, exposed and vulnerable. It is a great injustice that this monument isn’t given world heritage status and the protection it richly deserves.
For further discussion of the importance of this site see Chapter 8 of Robert Temple’s book, Egyptian Dawn (2010).
©Graham Salisbury 2011
there is now a warden at the site and a signpost from the main road from larache to tetouan,its about 3 kms after the village of souk tnine de sidi el yamani( a mere petrol stop),heading for tetouan on the left hand side.i visited the site in late january this year2012.
I visited this site (M’Zopra) in 1982 and was astonished to see a similarity to the megalithic Newgrange site in Co. Meath, Ireland. No archaeologist in Ireland was aware of this similarity. I was pointed towards it by an Italian archaeologist. Subsequently I met James W. Mavor and his brilliant paper confirmed my belief that early Irish constructions were ultimately inspired by North African designs.
I produced 4 films on the subject (Atlantean) in 1984 and wrote books referring to it (Atlantean Irish, Quartet Books 1986 and The Atlantean Irish, Lilliput Press, 2005/11)
I am now revisiting the subject of Carthage as an early coloniser of Ireland.
Bob Quinn
[--Of course Tartessos preceeded Carthage by a wide margin and these structures were began before Tartessos and of the same original culture. Several stone circles include the circle-cross design such as this one has. The earliest circular patterned sites around the Mediterranean area go back before ten thousand years old and perhaps older than twelve thousand years old.  Large circular structures in the Atlas mountains area have been associated with Platos' story of Atlantis since Roman times. - Dale D.]