Dolbadern Castle is the building perched on the rocky outcrop in the lake. Turner made studies of the great round stone keep of this castle in sketchbooks
of 1798 and 1799. The watercolour design for this engraving was made in 1834.
By depicting the castle from a distance, Turner has opened out the landscape
to include the Llanberis Pass and the peak of Mount Snowdon in the top right corner. The powerful movement in the sky shows Turner portraying Welsh mountain scenery at its wildest.