What's the setting of the story "To Build a Fire" by Jack London?

The story "To Build a Fire" takes place on the Yukon trail. The first line of the story is "Day had dawned cold and gray when the man turned aside from the main Yukon trail." Even for the Yukon, the day is very cold, and there is no sun. The Yukon lies under a thick blanket of snow and ice. The only thing that stands out in the whiteness of the snow is the black line marking the Yukon Trail, which travels 500 miles to the Chilcoot Pass and to salt water. It also leads 75 miles north to Dawson and then 1,500 miles further to the Bering Sea. The temperature is 75 degrees below zero, which does not mean much to the man in the story because he doesn't understand it. After all, he is a newcomer to the Yukon.