Top: St. Andrews Bay on remote South Georgia island, en route to Antarctica from the Falkland Islands, is home to 250,000 pairs of king penguins, the island’s largest colony. Below: A crew member of the National Geographic Explorer ship walks on “fast ice,” or thick sea ice that’s held fast to the shore at Wilhelmina Bay on the Antarctic Peninsula.

Top: St. Andrews Bay on remote South Georgia island, en route to Antarctica from the Falkland Islands, is home to 250,000 pairs of king penguins, the island’s largest colony. Below: A crew member of the National Geographic Explorer ship walks on “fast ice,” or thick sea ice that’s held fast to the shore at Wilhelmina Bay on the Antarctic Peninsula.