Drakendir

From Tardis Wiki, the free Doctor Who reference

Drakendir, meaning Dragon's Cup, was a huge waterfall on the planet Traken, located 10 miles from Caslandir. The waterfall fell from a lake on a cliffside, plummeting into a deep canyon below, giving the effect of a dragon's roar. Gigantic clouds of spray hung in the air, obscuring the view of the canyon. A tower stood at the top of the waterfall, with water passing by on either side.

Viola once took Jamie McCrimmon on horse to see the falls, and both were amazed by the sights they saw there. They spent some time there, and using her powers, Viola summoned a rainbow warrior she called Sir Real of Dali to fight Jamie. Meant to be an illusion, Sir Real actually turned out to be more corporeal than expected, and so the pair of them ended up having to fight for their lives. (PROSE: The Astronomer's Apprentice [+]Loading...["The Astronomer's Apprentice (short story)"])