From glacier‑draped peak to the tallest lake island in the United States — born between July 13 and August 6, 2025.
📍 New island
Once a nunatak (rock surrounded by ice), Prow Knob is now completely surrounded by water, confirmed by NASA Landsat satellite imagery. It rises ~975 feet above Alsek Lake.
🌊 Climate landmark
The separation happened because the Alsek Glacier retreated more than 3 miles since 1984 — a visible pulse of climate change in Glacier Bay National Park, Alaska.
📌 Quick facts
Tallest lake island in the U.S. (975 ft / ~300 m)
Located in Alsek Lake, southeastern Alaska
Surrounded by water since summer 2025
Once connected to Alsek Glacier
Area: ~2 square miles
Confirmation: NASA Landsat 5 & 9
Part of Glacier Bay National Park & Preserve
Name derives from nearby Prow Mountain
🏔️ What is ProwKnob.com?
This domain is dedicated to documenting and sharing the story of Earth's newest geographic wonder — a glacial island born in our lifetime. Whether you’re a geographer, journalist, climate educator, or traveler, this is the home for accurate, evolving information about Prow Knob.