NEW ORLEANS—In the HBO TV series "Game of Thrones," a great wall of ice helps repel giants and the undead. But could such a structure be possible here on Earth? A new study suggests that, no, it's not realistic, because without magic, such a barrier would fall rapidly.
The gigantic icy barrier simply known as "the Wall" in "Game of Thrones" is about 700 feet (215 meters) high, 300 miles (480 kilometers) long and wide enough at its top for a dozen mounted knights to ride side by side. One of the nine wonders made by humans in George R.R. Martin's "A Song of Ice and Fire" (from which "Game of Thrones" is adapted), the Wall was built by the legendary figure known as Brandon the Builder, with the aid of giants.
The aim of the Wall is to defend the northern border of the Seven Kingdoms. To protect the Wall against invaders, the military order known as the Night's Watch possesses 19 forts, such as the Shadow Tower and Castle Black.
But how strong would such a great ice wall actually be? The problem with ice is that it can flow, said study author Martin Truffer, a glaciologist at the University of Alaska Fairbanks.

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