2015 Map of Lower Geyser Basin

About this map

The Lower Geyser Basin within Yellowstone National Park reveals a complex hydrothermal landscape shaped by the Firehole River and its numerous tributaries. This area is characterized by high concentrations of geothermal features, from the Fountain Geyser and Bellefontaine Geyser to expansive thermal areas like Sentinel Meadows and Fountain Flats. The map documents a dense network of springs and pools, including the Queens Laundry, Ojo Caliente Spring, and the Quagmire Group. Transportation through this volatile terrain is primarily facilitated by the Grand Loop Rd and Firehole Canyon Rd, while hikers can navigate more remote sections via the Sentinel Meadows Trail and Imperial Meadows Trail. The presence of features like Midway Bluff and the Porcupine Hills provides topographic context to the basin's thermal activity.