Most Detailed Map of Antarctica’s Hidden Landscape Unveiled

Scientists have produced the most detailed map so far of the terrain beneath Antarctica’s vast ice sheet, revealing a complex subglacial landscape of mountains, canyons, valleys, plains, and tens of thousands of previously unknown hills.

Key Findings
The new mapping effort uncovered more than 30,000 previously uncharted hills, each rising at least 50 metres (165 feet) above the surrounding terrain, along with numerous smaller landforms hidden beneath the ice.

Methodology Used
Researchers combined high-resolution satellite observations with a technique known as ice-flow perturbation analysis.
This method estimates subglacial topography and conditions by analysing surface features and ice-flow behaviour, allowing scientists to map even previously unexplored regions of the continent with unprecedented precision.

About Antarctica’s Subglacial Terrain

• Antarctica is about 40% larger than Europe, 50% larger than the United States, and roughly half the size of Africa.
• The continent’s hidden terrain reflects a dynamic geological history shaped long before it was buried under ice.

Antarctic Ice Sheet Facts

• The Antarctic Ice Sheet is the largest mass of ice on Earth.
• It holds around 70% of the planet’s freshwater.
• Average thickness: ~2.1 km (1.3 miles)
• Maximum thickness: ~4.8 km (3 miles)

Geological History
Antarctica was not always ice-covered.

• Many subglacial features were sculpted before the ice sheet formed more than 34 million years ago.
• These landforms were later modified by the movement and pressure of the ice sheet.
• Antarctica was once connected to South America and later separated due to plate tectonics, involving the slow movement of Earth’s continental plates.

Significance
The detailed mapping improves understanding of:

• Ice-sheet dynamics and stability
• Sea-level rise projections
• Antarctica’s ancient geological evolution