Stock photography, photos: Mirror Pool Fall Color Stock photos of Pond in the Mirror Pool area of Sheyenne National Grassland reflects the fall colors. Sheyenne National Grassland, North Dakota. Photograph: © Matthew Thalman Click for a larger image and more information Keywords associated with this stock photo: America, National Grassland, North America, North Dakota, Sheyenne National Grassland, United States, United States of America, US, USA, lake, water, autumn, fall, fall color, autumn color, tree, trees, forest, reflection