It is called Stonehenge
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Ziggurat
Assuming that 160 acres is a huge perfect square, there will approximately be 12.649 acres to each side. The length of one side of an acre is about 208.7 feet. Multiplying 12.649 by 208.7 to get the total length of one side of the huge square, the result is 2,639.85 feet. Next, draw an imaginary straight line from one corner of the huge square to the opposite corner, forming a diagonal inside the huge square. Using Pythagorean theorem to get the length of this diagonal, the result is 3,733.31 feet. Divide this by 2 and the result is 1,866.66 feet, the radius of 160 acres.
A Huge ASS
Valleys deepening and widening are caused by several factors. V-shaped valleys are caused by forces such as erosion and rivers. Valleys are not at all formed by rivers. Valleys that are not V-shaped were formerly occupied by glaciers and are characteristically U-shaped, formed by the huge bodies of ice that moved along; they carved the valleys as they passed, carrying away giant boulders and huge amounts of debris.
Icosikaitetra (not icosikaitera) is an adjective that means 24. The question does not specify whether it is a polygon with 24 sides or a polyhedron with 24 faces. Even if it were known that it was a polygon, there is no information on its shape - it can be convex or concave, small or huge.