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Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the LeConte Glacier near Petersberg, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the LeConte Glacier near Petersberg, Southeast Alaska, United States of America

Glacial iceberg detail from ice calved off the LeConte Glacier near Petersberg, Southeast Alaska, United States of America

Adult humpback whale (Megaptera novaeangliae) breaching along the west side of Chatham Strait in Alaska, United States of America

Adult humpback whale (Megaptera novaeangliae) breaching along the west side of Chatham Strait in Alaska, United States of America

Adult humpback whale (Megaptera novaeangliae) tail throw among feeding whales in Southeast Alaska, United States of America

Scenic view from Tracy Arm-Fords Terror Wilderness area in Southeast Alaska, United States of America

Partial View of Mount Denali (Mount McKinley) in Denali National Park, Alaska, United States of America

View of the Polychrome Mountains from lookout point on the park road inside Denali National Park and Preserve, Alaska, United States of America

Riding the bus along the 92 mile-long road into Denali National Park, Alaska, United States of America

View of the Polychrome Mountains from lookout point on the park road inside Denali National Park and Preserve, Alaska, United States of America

View of the Polychrome Mountains from lookout point on the park road inside Denali National Park and Preserve, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

View from Park Service platform where adult brown bears (Ursus arctos) forage for salmon, Katmai National Park, Alaska, United States of America

Mendenhall Glacier and Lake, with iceberg, bright blue ice, forest and mist, from Visitor Centre, Juneau, Alaska, United States of America, North America

Rudyerd Bay ripples, beautiful summer day, Misty Fjords National Monument, Tongass National Forest, Alaska, United States of America, North America

Colourful kayaks, Aialik Glacier, blue ice, Harding Icefield, Kenai Fjords National Park, near Seward, Alaska, United States of America, North America

Spectacular Tracy Arm Fjord, brilliant blue icebergs and backlit clearing mist, mountains and South Sawyer Glacier, Alaska, United States of America, North America

Moon Jellyfish (Aurelia aurita), Resurrection Bay, Kenai Fjords National Park, Alaska, United States of America, North America

Fall color change amongst the trees and shrubs in Denali National Park, Alaska, United States of America, North America

Stranded ice on the low tide in front of Lamplugh Glacier, Glacier Bay National Park and Preserve, Alaska, United States of America, North America

A pair of tufted puffins (Fratercula cirrhata), South Marble Island, Glacier Bay National Park, Southeast Alaska, United States of America, North America

A raft of common murres (Uria aalge) at breeding site on South Marble Island, Glacier Bay National Park, Alaska, United States of America, North America

An adult sea otter (Enhydra lutris) resting on its back in the harbor at Kodiak, Kodiak Island, Alaska, United States of America, North America

An adult sea otter (Enhydra lutris) resting on its back in the harbor at Kodiak, Kodiak Island, Alaska, United States of America, North America

A small group of Dall sheep (Ovis dalli) grazing on a mountainside in Denali National Park, Alaska, United States of America, North America

Aerial view of the Leconte Glacier, flowing from the Stikine Ice Field near Petersburg, Southeast Alaska, United States of America, North America

Adult bald eagle (Haliaeetus leucocephalus) on iceberg near Johns Hopkins Glacier, Southeast Alaska, United States of America, North America

Views from the fishing town of Petersburg on Mitkof Island, Southeast Alaska, Pacific Ocean, United States of America, North America

Scenic view of Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Southeast Alaska, Pacific Ocean, United States of America, North America

Adult bull killer whale (Orcinus orca) surfacing in Chatham Strait, Southeast Alaska, United States of America, Pacific Ocean, North America

Guest from the Lindblad Expeditions ship National Geographic Sea Bird on path beside a skull in Southeast Alaska, United States of America, North America

Bald wagle (Haliaeetus leucocephalus) portrait, Alaska Raptor Rehabilitation Center, Sitka, Baranof Island, Alaska, United States of America, North America

Fall color change amongst the trees and shrubs in Denali National Park, Alaska, United States of America, North America

A large stand of Arctic cotton (Eriophorum callitrix) in Denali National Park, Alaska, United States of America

Float planes used to fly guests in to the Brooks Lodge and campground in Katmai National Park near Bristol Bay, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

View from Park Service platform where adult brown bears (Ursus arctos) forage for salmon, Katmai National Park, Alaska, United States of America

Adult brown bear sow (Ursus arctos) watching human activities at the Brooks River, Katmai National Park, Alaska, United States of America

Mountain and forest landscape in Denali National Park, Alaska, United States of America, North America

An adult Arctic ground squirrel (Urocitellus parryii) feeding in the brush at Denali National Park, Alaska, United States of America, North America

Long exposure astrophotography showing the stars and the northern lights in Denali National Park, Alaska, United States of America, North America

An adult humpback whale (Megaptera novaeangliae), flukes-up dive near boat in Kenai Fjords National Park, Alaska, United States of America, North America

Adult humpback whale (Megaptera novaeangliae), breaching in Sitka Sound, Southeast Alaska, United States of America, North America

Detail of ice calved from the Leconte Glacier but stranded on a terminal moraine, Petersburg, Southeast Alaska, United States of America, North America

Aerial view of the Leconte Glacier, flowing from the Stikine Ice Field near Petersburg, Southeast Alaska, United States of America, North America

A lighthouse just outside the city of Sitka, Sitka Sound, Southeast Alaska, United States of America, North America

Steller sea lion (Eumetopias jubatus), hauled out on South Marble Island, Glacier Bay National Park, Southeast Alaska, United States of America, North America

Harbor seal (Phoca vitulina), mother with pup at South Sawyer Glacier, Tracy Arm, Southeast Alaska, United States of America, North America

Adult harbor seals (Phoca vitulina), on ice at Dawes Glacier, Endicott Arm, Southeast Alaska, United States of America, North America

Bull porcupine caribou (Grant's caribou) (Rangifer tarandus granti), Denali National Park, Alaska, United States of America

Names of fishing boats painted on the rocks in Cross Sound with the Fairweather Mountain Range as backdrop, Alaska, United States of America, North America

Glacial iceberg detail from ice calved off the South Sawyer Glacier in Tracy Arm, Southeast Alaska, United States of America, North America

Adult humpback whale (Megaptera novaeangliae) flukes-up dive in Inian Pass, Southeast Alaska, Pacific Ocean, United States of America, North America

Scenic view of Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Southeast Alaska, Pacific Ocean, United States of America, North America

Mushrooms growing in the Tongass National Forest in southeast Alaska, Pacific Ocean, United States of America, North America

Scenic views of the south Sawyer Glacier in Tracy Arm-Fords Terror Wilderness area in Southeast Alaska, United States of America, North America

Scenic views of the south Sawyer Glacier in Tracy Arm-Fords Terror Wilderness area in Southeast Alaska, United States of America, North America

Guests from the Lindblad Expeditions ship National Geographic Sea Bird in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Guests from the Lindblad Expeditions ship National Geographic Sea Bird in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Guests from the Lindblad Expeditions ship National Geographic Sea Bird during Zodiac operations near LeConte Glacier in Southeast Alaska, United States of America, North America

Zodiac with Lindblad guests near harbor seal (Phoca vitulina) hauled out on ice calved from the South Sawyer Glacier in the Tracy Arm-Ford's Terror Wilderness area, Southeast Alaska, United States of America, North America

Long exposure astrophotography showing the stars and the northern lights in Denali National Park, Alaska, United States of America, North America

Aurora Borealis (Northern Lights) viewed from Denali Princess Wilderness Lodge, Denali National Park, Alaska, United States of America, North America

Rainbow colours and low hanging mist over Icy Strait, between Chichagof Island and Glacier Bay National Park, UNESCO World Heritage Site, Alaska, United States of America, North America

Kayak expedition preparations, Tracy Arm Fjord, clearing mist, icebergs and cascades, near South Sawyer Glacier, Alaska, United States of America, North America

Ice pack and blue ice face of South Sawyer Glacier, mountain backdrop, Stikine Icefield, Tracy Arm Fjord, Alaska, United States of America, North America

Blue ice face and floating ice, Sawyer Glacier and mountains, misty conditions, Stikine Icefield, Tracy Arm Fjord, Alaska, United States of America, North America

Adult tufted puffin (Fratercula cirrhata), on cliff ledge on St. Paul Island, Pribilof Islands, Alaska, United States of America, North America

Adult red-legged kittiwake (Rissa brevirostris), St. Paul Island, Pribilof Islands, Alaska, United States of America, North America

Black-legged kittiwake (Rissa tridactyla) pair on nest in McBride Inlet, Glacier Bay National Park, Alaska, United States of America, North America

Snow covered mountains and fall color change amongst the shrubs and trees, Denali National Park, Alaska, United States of America, North America

Scenic views of the south Sawyer Glacier in Tracy Arm-Fords Terror Wilderness Area in Southeast Alaska, United States of America, North America

Ice calved off the South Sawyer Glacier, Tracy Arm, Southeast Alaska, United States of America, North America

Detail of ice calved from the Leconte Glacier but stranded on a terminal moraine, Petersburg, Southeast Alaska, United States of America, North America

A mother sea otter (Enhydra lutris) eating a Dungeness crab with her pup in the Inian Islands, Southeast Alaska, United States of America, North America

Totem poles in Freedom Park, just outside the city of Sitka, Southeast Alaska, United States of America, North America

Harbor seal (Phoca vitulina), mother and pup on ice at South Sawyer Glacier, Tracy Arm, Southeast Alaska, United States of America, North America

Harbor seal (Phoca vitulina), mother and pup on ice at South Sawyer Glacier, Tracy Arm, Southeast Alaska, USA.

A lone adult male killer whale (Orcinus orca) encountered in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, Pacific Ocean, North America