White Agony Plains are part of the Klondike region in America. Numerous caverns are found under the plains, with one of them hiding the legendary Golden Lagoon, an underground lake full of molten gold.
During the Klondike Gold Rush in the 1890s, Scrooge McDuck and Goldie O'Gilt searched the caverns under the plains for the Golden Lagoon, without success. Their map was torn in half, and one half of the map got stuck among the teeth of a wooly mammoth that attacked them. A century later, Flintheart Glomgold drilled for oil in White Agony Plains and found the skeleton of the same wooly mammoth that attacked Scrooge and Goldie. With the missing half of the map, Scrooge and Goldie, hounded by Glomgold, returned to White Agony Plains to find the Golden Lagoon.