YVO Monthly Video Update September 30, 2025 The Yellowstone caldera is vast – 45 miles across by 30 miles wide. You could fit over 60 islands of Manhattan in this area. There are deep canyons, like the one on the Yellowstone River, that reveal a complex geologic history. And, forested landscapes and features remind us that this special place is ever-changing. The broad expanse of the caldera presents a challenge for monitoring seismic, volcanic, and hydrothermal activity. Where should monitoring