Snow-covered mountains near Petermann Island on the west side of the Antarctic Peninsula.

Icebergs and brash ice reflected in calm waters on the west side of the Antarctic peninsula, Antarctica.

Views of the scenic Lemaire Channel on the west side of the Antarctic peninsula in Antarctica. Shown here is the National Geographic Endeavour navigating the channel through ice floes in late spring.

Sunset on snow-capped mountains and icebergs surrounded in brash ice in Crystal Sound near the Antarctic Circle on the west side of the Antarctic Peninsula.

Adult Emperor Penguin (Aptenodytes forsteri) resting on ice floe below the Antarctic circle on the western side of the Antarctic Peninsula. These are individuals that have hauled out, possibly to rest from foraging.

Adult emperor penguin pair (Aptenodytes forsteri) resting on ice floe with three Adelie penguins (Pygoscelis adeliae) nearby below the Antarctic circle on the western side of the Antarctic Peninsula. These are individuals that have hauled out, possibly to

Adult Emperor Penguin (Aptenodytes forsteri) resting on ice floe below the Antarctic circle on the western side of the Antarctic Peninsula. These are individuals that have hauled out, possibly to rest from foraging.

Sunset on snow-capped mountains and icebergs surrounded in brash ice in Crystal Sound near the Antarctic Circle on the west side of the Antarctic Peninsula.

Sunset on snow-capped mountains and icebergs surrounded in brash ice in Crystal Sound near the Antarctic Circle on the west side of the Antarctic Peninsula.

An adult leopard seal (Hydrurga leptonyx) hauled out and resting among the icebergs in the Ererra Channel near the west Coast of the Antarctic peninsula, southern ocean. This seal is the only pinniped known to have attacked and killed a human being in Ant

An adult leopard seal (Hydrurga leptonyx) hauled out and resting among the icebergs in the Ererra Channel near the west Coast of the Antarctic peninsula, southern ocean. This seal is the only pinniped known to have attacked and killed a human being in Ant

A mother and newborn pup leopard seal (Hydrurga leptonyx) hauled out on ice floes on the western side of the Antarctic peninsula, southern ocean. This is the only pinniped known to have attacked and killed a human snorkeler in Antarctica.

Multi-year ice floes on the west side of the Antarctic Peninsula.