Black Sand Basin Black Sand Basin is not often mentioned in the strategy of Yellowstone Park. In fact, this place also has amazing geothermal hot springs. If you come here to watch different styles of hot springs and lakes, you will feel worthwhile. The basin is located in the upper geyser area, but it is an independent group, composed of hot springs, geysers and lakes. The length of its pedestrian plank road is not long, only 0.4 kilometers, and there are not many tourists, so it is a good place for the elderly and children to relax and watch the scenery. At the entrance of the Black Sand Basin, signs explain why it is called the Black Sand Basin and why there are geysers and hot springs of color in the geysers.