Two Largest Islands in the Arctic Ocean: Greenland and Ellesmere Island

1. Greenland (Kalaallit Nunaat)

• Area: 2,166,086 km² (836,330 sq mi) — world's largest island
• Location: Between Arctic & Atlantic Oceans
• Politics: Autonomous territory within Kingdom of Denmark
• Population: ~56,000 (mostly Inuit)
• Ice Sheet: 80% covered (1.7M km³ ice)

2. Ellesmere Island (Canada)

• Area: 196,236 km² (75,767 sq mi) — 10th largest globally, 3rd in Canadian Arctic Archipelago
• Location: Nunavut, northernmost Canada (Cape Columbia = 83°N)
• Population: ~200 (Grise Fiord, Alert, Eureka)
• Features: Ice caps, fjords, Lake Hazen (largest north of Arctic Circle), Quttinirpaaq NP

Other Large Arctic Islands

• Baffin Island (507K km²) — larger than Ellesmere but mostly in Atlantic drainage
• Severnaya Zemlya, Novaya Zemlya (Russia)
• Svalbard (Norway)
• Banks, Victoria, Devon (Canada)

Greenland dwarfs all others; Ellesmere is the true "High Arctic" island.