The Antarctic Peninsula is the long, narrow arm of land that extends northward from the main body of Antarctica toward the southern tip of South America. It reaches to about 63°S latitude, making it the only major part of the continent that stretches well north of the Antarctic Circle. The nearest point to South America is just over 1,000 kilometers (roughly 620 miles), separated by the Drake Passage.
Position Relative to South America
If you look at a map of the Southern Hemisphere, the Antarctic Peninsula appears to be reaching up toward Chile and Argentina like a crooked finger. It’s the closest part of Antarctica to any other continent. The city of Ushuaia, Argentina, at the tip of South America, serves as the primary departure point for ships crossing the Drake Passage to reach the peninsula. That crossing takes roughly two days by sea.
The peninsula curves in a distinctive S-shape from the main continental mass. Geologically, it shares a deep connection with South America. The rock beneath it formed from volcanic and sedimentary material, and the mountain spine running down its center is considered a continuation of the Andes mountain chain. Over tens of millions of years, the narrow land bridge between the two continents deformed and ruptured, opening the Drake Passage and isolating Antarctica.
Seas and Ice Shelves on Each Side
The peninsula divides two very different ocean basins. To the east lies the Weddell Sea, known for its bitterly cold waters and heavy sea ice. To the west lies the Bellingshausen Sea, which connects to the broader Pacific sector of the Southern Ocean and brings relatively warmer water along the western coastline. This temperature difference gives the two sides of the peninsula noticeably different characters.
Several major ice shelves cling to the peninsula’s coasts. The Larsen Ice Shelf, on the eastern (Weddell Sea) side, has become one of the most closely watched features in climate science after sections of it disintegrated dramatically in recent decades. The Wilkins Ice Shelf, on the western side near the base of the peninsula, has also been on the verge of collapse. The George VI Ice Shelf sits farther south, wedged between the peninsula and Alexander Island.
Climate and Warming
The Antarctic Peninsula is the warmest part of the continent, and it has been warming faster than the rest of Antarctica. Weather stations along the peninsula have recorded a pronounced temperature increase over the past several decades, even as stations on the vast interior plateau showed little change or slight cooling during the same period. Across the continent as a whole, temperatures have risen about 0.5°C (1°F) since 1957, but the peninsula’s increase has been steeper because it juts into the Southern Ocean, where warmer currents have a stronger influence.
This warming is directly linked to the ice shelf collapses on the peninsula’s eastern side. As surface temperatures rise, meltwater pools on top of the shelves, seeps into cracks, and weakens the ice from within. The loss of these shelves matters because they act as a brake on the glaciers behind them. Once a shelf disintegrates, the glaciers it was holding back speed up and contribute to sea level rise.
Wildlife on the Peninsula
The peninsula supports more visible wildlife than almost anywhere else on the continent. Its relatively mild temperatures and productive coastal waters make it a hub for breeding and feeding. Gentoo penguins are common throughout the region and hold the title of fastest-swimming penguin species. Chinstrap penguins nest on rocky beaches, and Adélie penguins breed in large colonies along the coastline. The surrounding waters are rich in krill, which supports not only penguins but also humpback whales, minke whales, and blue whales that feed in the area during the austral summer.
Research Stations and Human Activity
More than a dozen countries operate research stations on or near the Antarctic Peninsula, making it the most densely occupied part of the continent. The UK’s Rothera Research Station, located on Adelaide Island off the peninsula’s western coast, is one of the largest. It has been staffed year-round for over 50 years and supports work in marine biology, glaciology, geology, and meteorology. Argentina, Chile, Brazil, South Korea, Poland, and several other nations also maintain stations in the region.
Three countries have overlapping territorial claims on the peninsula: the United Kingdom, Argentina, and Chile. These claims predate the Antarctic Treaty, which was signed in 1959 and essentially froze all territorial disputes. Under the treaty, no country can enforce sovereignty, and no new claims can be made while the agreement remains in force. In practice, the peninsula operates as an international research zone governed by consensus among treaty nations.
Tourism Traffic
The peninsula is also the center of Antarctic tourism. During the 2023-24 season, more than 120,000 tourists visited the peninsula region across all vessel types, from small expedition ships to large cruise liners. About 98% of all Antarctic tourism voyages operate in the peninsula area during the seven-month austral summer from October to April. Most depart from Ushuaia. In that single season, 51 traditional expedition vessels made 429 departures carrying over 71,000 passengers, while nine large cruise ships brought an additional 43,000 visitors who viewed the scenery from the deck without going ashore. Preliminary estimates for the 2024-25 season projected slightly lower numbers, with around 106,000 total peninsula visitors across all vessel categories.