Noah's Ark: Amazing New Discovery (2)

Satellite images reveal amazing new evidence of Noah's ark.
Who built these?
At geographical center of four continents Asia, Africa, America, and Australia.

These arc have similar orientation.
Arc-angle measuring 120 degrees.
Highest peak on the centerline.

In addition to the Large Geographical Center Arcs.
Several Smaller Arcs have been located.
A 12-mile diameter arc, near Kirkkayak Turkey.
Measuring 120 degrees.
And nearby is located, the town of Kirkkayak, Turkey.

Another arc was found in Africa.
An arc near Kassala, Sudan.
Measuring 120 degrees.
Built on the banks of Atbara.

And the most recent discovery.
An arc in South America.
A 4-mile arc near Picos, Brazil.
Measuring 120 degrees.
The town of Junco lies to the South.
"Junco" in Portuguese means "boat".

Who built these?