It's huge, it's gigantic, it's an antique kerman. The design is what is sometimes referered to as a Triclinium carpet. On the left hand portion of the photograph below (or usually the bottom of these types of rugs), there are 3 rectangular panels which each could be their own carpet. The full 21' width, and framed at what would be the top of the rug (or the right hand side of the photograph). Although the carpet appears to be several different pieces or carpets put together, this is probably one massive carpet woven on a single loom.
What an example! Measuring in at some 21'1" x 35'7", that's 750.22 Square Feet: The second largest Antique Oriental Carpet we know of in the United States. Some really nice design elements of Cypress trees and flowers. knot density appears to be a tighter weave, perhaps in the vicinity of 200 KPSI.
*Note to consumers: On our monitor, contrast seems slightly high in areas of this rug. In addition, we have noted areas of images which imply the use of a clone stamp on the grass. We are not making accusations against the seller, only suggesting you contact the seller for specifics on condition and colors if this is the rug for you. Ask for completely unaltered images.
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Here's a similar map for a Triclinium carpet as seen on Barry's Page about a Sotheby's Bidjar Carpet on SpongoBongo.com for Carpets