Duck Lake in Yellowstone National Park is just off the Grand Loop Road and Yellowstone Lake can be seen in the distance. The Grand Loop Road is the primary road system in Yellowstone National Park. Grand Loop Rd. includes unsigned portions of US 20, US 89, US 191 and US 287, all of which traverse the park.
The Upper Geyser Basin has the highest concentration of geothermal features in Yellowstone National Park. This complement of features includes the most famous geyser in the park, Old Faithful Geyser, as well as four other predictable large geysers. One of these large geysers in the area is Castle Geyser which is about 1,400 feet northwest of Old Faithful. Castle Geyser has an interval of approximately 13 hours between major eruptions, but is unpredictable after minor eruptions. The other three predictable geysers are Grand Geyser, Daisy Geyser, and Riverside Geyser. Wikipedia
