Drammankin Lake

The Lake of Mutations, formerly known as Drammakin Lake, was a body of water on Skaro located near a mountain range. It was home to mutations created by the use of chemical-biological weapons during the Thousand Year War.

History
Nasgard's family lived in a villa by the lakeside for generations. During his childhood, Davros spent much of his time sitting by the lake, as he was fascinated by the creatures that lived within it. (BFD: Innocence)

Years later, the Dalek City was built near the mountain range bordering the now-polluted Lake. Giant pipes went directly through the mountains to the Lake for the City's water supply. (DW: The Daleks) The Daleks also kept their anti-missile rockets beneath the waters of the Lake. (DC: Impasse, The Terrorkon Harvest)

A Terrorkon, one of the creatures living in the Lake, attacked a Dalek station, but was itself attacked and killed by an giant eel-like creature. (DC: The Terrorkon Harvest)

Three members of the Thal party led by Temmosus were killed by creatures in the Lake when they first discovered it. Ian Chesterton led a second trip around the Lake to sneak into the City, during which another Thal, Elyon, was killed by one of the creatures. (DW: The Daleks)