Ross Sea in the context of "Imperial Trans-Antarctic Expedition"

Orcas or killer whales have a cosmopolitan distribution and several distinct populations or types have been documented or suggested. Three to five types of orcas may be distinct enough to be considered different races, subspecies, or possibly even species (see species problem). The IUCN reported in 2008, "The taxonomy of this genus is clearly in need of review, and it is likely that O. orca will be split into a number of different species or at least subspecies over the next few years." However, large variation in the ecological distinctiveness of different orca groups complicate simple differentiation into types. Mammal-eating orcas in different regions were long thought likely to be closely related, but genetic testing has refuted this hypothesis.

The Ross Dependency is a region of Antarctica defined by a sector originating at the South Pole, passing along longitudes 160° east to 150° west, and terminating at latitude 60° south. It is claimed by New Zealand, a claim mutually accepted only by Australia, the UK, France and Norway, which are countries that also have territorial claims in Antarctica. Under the 1961 Antarctic Treaty, of which all territorial claimants are signatories, including New Zealand, all claims are held in abeyance. Article IV states: "No acts or activities taking place while the present Treaty is in force shall constitute a basis for asserting, supporting or denying a claim to territorial sovereignty in Antarctica or create any rights of sovereignty in Antarctica".

The Dependency takes its name from Sir James Clark Ross, who discovered the Ross Sea and includes part of Victoria Land, and most of the Ross Ice Shelf. Ross, Balleny, Scott and Roosevelt Islands also form part of the Dependency.

Marie Byrd Land (MBL) is an unclaimed region of Antarctica. With an area of 1,610,000 km (620,000 sq mi), it is the largest unclaimed territory on Earth. It was named after the wife of American naval officer Richard E. Byrd, who explored the region in the early 20th century.

The territory lies in West Antarctica, east of the Ross Ice Shelf and the Ross Sea and south of the Pacific Ocean portion of the Antarctic or Southern Ocean, extending eastward approximately to a line between the head of the Ross Ice Shelf and Eights Coast. It stretches between 158°W and 103°24'W. The inclusion of the area between the Rockefeller Plateau and Eights Coast is based upon Byrd's exploration.

79°S 100°W / 79°S 100°W / -79; -100

West Antarctica, or Lesser Antarctica, one of the two major regions of Antarctica, is the part of that continent that lies within the Western Hemisphere, and includes the Antarctic Peninsula. It is separated from East Antarctica by the Transantarctic Mountains and is covered by the West Antarctic Ice Sheet. It lies between the Ross Sea (partly covered by the Ross Ice Shelf), and the Weddell Sea (largely covered by the Filchner-Ronne Ice Shelf). It may be considered a giant peninsula, stretching from the South Pole towards the tip of South America.

77°28′S 162°31′E / 77.467°S 162.517°E / -77.467; 162.517

The McMurdo Dry Valleys are a series of largely snow-free desert valleys on the continental coastline of Victoria Land, Antarctica, east of the East Antarctic Ice Sheet and west of McMurdo Sound and the Ross Sea. The Dry Valleys are notable for being the coldest and driest desert in the world, as well as being the largest ice-free region in Antarctica; as a result, the Valleys have become a notable hotbed for scientific research in the Antarctic region. The Dry Valleys' unique climate is due to their location nestled within the Transantarctic Mountains along with high-pressure katabatic winds that scour away snowfall and humidity across the region. Surrounding mountains prevent the flow of ice from nearby glaciers. The region's geology is primarily granites and gneisses, and glacial tills dot the bedrock landscape, with loose gravel covering the ground. The Valleys are one of the driest places on Earth, though there are several anecdotal accounts of rainfall within the Dry Valleys.

Iceberg B 15 was the largest recorded iceberg by area. It measured around 295 by 37 kilometres (159 by 20 nautical miles), with a surface area of 11,000 square kilometres (3,200 square nautical miles), about the size of the island of Jamaica. Calved from the Ross Ice Shelf of Antarctica in March 2000, Iceberg B-15 broke up into smaller icebergs, the largest of which was named Iceberg B-15-A. In 2003, B-15A drifted away from Ross Island into the Ross Sea and headed north, eventually breaking up into several smaller icebergs in October 2005. In 2018, a large piece of the original iceberg was steadily moving northward, located between the Falkland Islands and South Georgia Island. As of August 2023, the U.S. National Ice Center (USNIC) still lists one extant piece of B-15 that meets the minimum threshold for tracking (70 km or 20 sq nmi). This iceberg, B-15AB, measures 20 km × 7 km (11 nmi × 4 nmi); it is currently grounded off the coast of Antarctica in the western sector of the Amery region.

Scott Island is a small uninhabited island of volcanic origin in the Ross Sea, Southern Ocean, 505 kilometres (310 mi) northeast of Cape Adare, the northeastern extremity of Victoria Land, Antarctica. It is 565 metres (618 yd) long north–south, and between 130 metres (140 yd) and 340 metres (370 yd) wide, reaching a height of 54 metres (177 ft) and covering an area of 4 hectares (9.9 acres). Haggits Pillar, a stack reaching 62 metres (203 ft) in height and measuring 50 metres (55 yd) in diameter, yielding an area of less than 0.2 hectares (0.5 acres), is located 250 metres (270 yd) west of the island. The island has two small coves with beaches, the rest of the island being surrounded by high cliffs. One of the coves is on the northeastern coast and the other opposite Haggitts Pillar on the western coast of the island.

The island was discovered and landed upon on 25 December 1902 by captain William Colbeck, commander of the SY Morning, the relief ship for Robert Scott's expedition. Colbeck originally planned to name the island Markham Island, after Sir Clements Markham, but later decided to name it after Scott. Haggits Pillar is named after Colbeck's mother's family name, Haggit. In 2006, a mapping expedition to the Ross Sea found the islands 2.3 kilometres (1.4 mi) north of their previously determined position.