At an estimated 19 miles wide, the Hiawatha impact crater would rank among the 25 largest known impact craters on Earth.
Notes on verification
Confirmed by the original Science Advances paper, NASA Earth Observatory, and Wikipedia, all consistently reporting the 19-mile (31 km) diameter and '25 largest' ranking. [cascade flags: wikipedia_dropped_other_sources_exist | tier=silver indep_score=1.0 clusters=2 claim_tier=notable]
Sources
- City-size impact crater found under Greenland ice (seed:history_and_archaeology)
- https://www.science.org/doi/10.1126/sciadv.aar8173 (corroboration)
- https://www.earthobservatory.nasa.gov/images/144279/crater-lurks-beneath-the-ice (corroboration)