Linnalla is a city in Eyrecradia, established by the Razdissi during their rule over the region.
It is smaller than the great residential caverns but is nearer the surface even than Caelythe, and is used as a diplomatic staging-post for dealing with overworlders. As such places are wont to do it has expanded and harbours merchants and ambassadors, mostly from nearby regions but some from further afield.
Building here can be ramshackle and is often free-standing rather than carved from the walls as in the deeper caverns. It is not however considered the principal avenue of ingress and egress to the region by the natives, since there are connecting tunnels to Razdis, Elbaraz and Shikurai deeper underground.
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http://www.giantitp.com/forums/showsinglepost.php?p=18049740&postcount=26