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Why is Muga silk unique to the Brahmaputra valley?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
Map highlighting the state of Assam in northeastern India, shaded in orange, with its capital Dispur marked. Assam is shown bordering Bhutan and Bangladesh, with surrounding countries and Indian states labeled for context. A small inset globe in the corner indicates Assam's location within Asia.
Assam

Muga silk is unique to the Brahmaputra valley because it is produced exclusively by the Indian Muga silkworm (Antheraea assamensis), which is found only in that specific region.1

Due to this restricted geographical origin and the silk's distinct golden quality, Muga was granted a geographical indications tag in 2007. This designation recognizes that the silk's unique characteristics and reputation are inextricably linked to the environment of the Brahmaputra valley. As a result, Muga remains the most prized and expensive variety of silk produced in Assam.1