The Weddell Sea and Ross Sea: Antarctica's Southern Marginal Seas

Both seas are deep embayments of the Southern Ocean indenting the Antarctic continent:

Weddell Sea

• Location: East of Antarctic Peninsula; south of 60°S, west of 20°W.
• Bounds: Antarctic Peninsula (west), Ronne Ice Shelf (south), Coats Land (east).
• Islands: South Orkney, South Shetland (northern fringe).
• Features: Permanent ice shelves (Filchner-Ronne); Weddell Gyre; source of Antarctic Bottom Water.
• History: Shackleton's Endurance trapped/crushed here (1915).

Ross Sea

• Location: South of New Zealand; 160°E–150°W, 70°S–78°S.
• Bounds: Victoria Land (west), Marie Byrd Land (east), Ross Ice Shelf (south—world's largest, ~487,000 km²).
• Islands: Ross Island (Mt. Erebus, McMurdo Station), Beaufort, Franklin.
• Features: Deepest Antarctic sea (>4,000 m); high biological productivity; Ross Sea Region MPA (1.55M km², largest marine protected area).
• History: Scott, Shackleton, Amundsen bases; "Gateway to the Pole."

Both are critical for bottom water formation, global overturning, and Antarctic ecology. The Ross Sea is more accessible (McMurdo logistics); the Weddell is ice-choked year-round.