Panorama of the Seven Springs that provide the source of The River Churn in Gloucestershire. Since the Churn is a main tributary of The River Thames many claim that it is the true source of this river rather than the spring at Trewesbury Mead near Kemble fourteen miles to the south. It is also pointed out that, unlike the spring at Trewesbury which usually dries up in the summer, the Seven Springs flow throughout the year.