Eldenroot (also spelled Elden Root) is a city in the province of Valenwood. It is one of several possible locations that the Eternal Champion may discover in The Elder Scrolls: Arena.
Eldenroot is a treethane of the Camoran Dynasty that rose from being a local trading post to a full-fledged power in its own right at the end of the First Era.
During the First Aldmeri Dominion, the capital of the dominion was this city. 
The Thalmor changed the capital of Valenwood from Falinesti to Elden Root for the duration of the Aldmeri Dominion in the Second Era.