Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Loch Ken -  Loch Ken is 9-mile long freshwater loch in Dumfries and Galloway Scotland. It lies in the Glenkens where it is fed from the north by the Water of Ken and from the west by the Dee. It continues as the Dee south from Glenlochar where the water is held back by the Glenlochar Barrage.
The answer to this question is:
Natural Place