On the Physical History of the Dee, Wales

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Abstract
T he surface of Bala Lake is 600 feet above the level of the sea, and is bounded on the north-west and south-east by hills that near the lake have elevations of about 1200 and 1300 feet, and therefore rise to heights of 600 and 700 feet above its level, while at greater distances, but still not far off, they rise to heights of 1800 and 1900 feet. On the south-west there is a long gentle slope, which attains a height of about 800 feet above the sea at the watershed close by the road to Dolgelli, or 200 feet above the lake, beyond which the river Wnion drains the country in a south-westerly direction into the estuary of the Mawddach. The lake is about 130 feet in depth; and at its north-eastern end the waters of the Dee, escaping from this basin, first traverse an alluvial tract nearly three miles in length, the detritus of which has been carried from the adjoining hills by rivers, the largest of which enters the Dee near Pont Treweryn, about half a mile below Bala. Other good-sized streams form tributaries of the Dee below this point, and have helped to distribute the materials of the alluvial plain, beyond which, for a space of about a mile, the hills close in upon the banks of the river between Glan-dwynant and Pont Llanderfel. Between this point and the neighbourhood of Corwen, the river, for more than six miles, again wanders through broad alluvial flats, after which

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