Girna (plural: giren) is the stone shelter in Malta. It is used as the shelter for live stock, food, tools as well as for the workers, protecting them from the sun and the heat.
Giren are located on the fields: in the middle as well as at the border, incorporated to the stone fence, with the entrance, faced to the field.
The ground plan of girna is circle or square inside; it is possible that girna has circular inner part, but outside is rather circular or square shaped.
There is not only one or typical proportional system: the shelters use equilateral triangle, which defines the height of construction; height is sum of radius of ground plan plus width of the wall; as well as square, square root of two, and golden section.
The girna is so sophisticated shaped that it seems to be a part of nature itself.