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1. So my new thing here is the #10tweetadventure - exploring corners of history or landscape, but told in no more than 10 tweets. Today, for @FingerpostFri #FingerpostFriday, let's start with the source of the River Thames. Except… it isn't. 
2. For one thing, the site in Trewsbury Meadow has totally dried up - fair enough, it was always seasonal. But half a mile downstream is Lyd Well, in the area marked on old maps as Thames Head. But alas this was bone dry today too.
3. The fons et origo, as it were, of historical accounts that this Thames Head is the source go back to John Leland in 1542: "Isis riseth at three myles from Cirencestre, not far from a village cawlled Kemble, within half a mile of the Fosseway, wher the very head of Isis is".
