Uploaded January 2026 | Updated September 2026, 2 weeks ago
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Cliff Geyser (16 August 2025)
Geysers are hot springs that episodically erupt columns of water. They occur in few places on Earth. The highest concentration of geysers anywhere is at the Yellowstone Hotspot Volcano in northwestern Wyoming, USA.
Cliff Geyser is the largest frequently-erupting geyser in the Black Sand Basin of Yellowstone’s Upper Geyser Basin. It’s located on the western bank of Iron Spring Creek and is separated from the stream by a ~1.5 meter tall cliff of geyserite. Cliff Geyser has a semicircular basin about 10 by 15 meters in size. The basin can be empty, partially filled, or overflowing with water. Eruptive activity occurs at a low-pool stage, high-pool stage, and at an overflowing, full pool stage. High-pool erupting can lead to a full pool eruption, which starts when overflow first occurs through a notch in the geyserite cliff near the southwestern corner of Cliff Geyser’s crater. Full pool eruptions (nicknamed “major eruptions” by some) range in duration from ~6 to ~22 minutes. Spouting can reach an estimated 30 to 50 feet high.
Black Sand Basin videos:
youtube.com/playlist?list=PL8dL6UmmXTBVwmCwqDQXjddb1pn82Whbf
Clips 1-2 - Cliff Geyser’s 1:45 to 1:55 PM full pool eruption on 16 August 2025.
Clip 3 - Cliff Geyser’s 2:32 to 2:42 PM full pool eruption on 16 August 2025. (time stamp 0:37)
Clips 4-7 - Cliff Geyser’s 6:04 to 6:18 PM full pool eruption on 16 August 2025. (time stamp 0:53)
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Cliff Geyser (16 August 2025)
Geysers are hot springs that episodically erupt columns of water. They occur in few places on Earth. The highest concentration of geysers anywhere is at the Yellowstone Hotspot Volcano in northwestern Wyoming, USA.
Cliff Geyser is the largest frequently-erupting geyser in the Black Sand Basin of Yellowstone’s Upper Geyser Basin. It’s located on the western bank of Iron Spring Creek and is separated from the stream by a ~1.5 meter tall cliff of geyserite. Cliff Geyser has a semicircular basin about 10 by 15 meters in size. The basin can be empty, partially filled, or overflowing with water. Eruptive activity occurs at a low-pool stage, high-pool stage, and at an overflowing, full pool stage. High-pool erupting can lead to a full pool eruption, which starts when overflow first occurs through a notch in the geyserite cliff near the southwestern corner of Cliff Geyser’s crater. Full pool eruptions (nicknamed “major eruptions” by some) range in duration from ~6 to ~22 minutes. Spouting can reach an estimated 30 to 50 feet high.
Black Sand Basin videos:
youtube.com/playlist?list=PL8dL6UmmXTBVwmCwqDQXjddb1pn82Whbf
Clips 1-2 - Cliff Geyser’s 1:45 to 1:55 PM full pool eruption on 16 August 2025.
Clip 3 - Cliff Geyser’s 2:32 to 2:42 PM full pool eruption on 16 August 2025. (time stamp 0:37)
Clips 4-7 - Cliff Geyser’s 6:04 to 6:18 PM full pool eruption on 16 August 2025. (time stamp 0:53)
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