Red Waste

The Red Waste is a region on the continent of Essos, located thousands of miles to the east of Westeros. It is located south and east of Vaes Dothrak and Lhazar. It is a harsh wilderness that even the Dothraki fear to cross.

Season 1
After pillaging the lands of Lhazar, the Dothraki khalasar of Khal Drogo skirts the northern edge of the Red Waste. It is here that Drogo falls from his horse and his khalasar scatters to the wind, and also where Daenerys's dragons hatch.

Season 2
Daenerys and her retainers travel across the Red Waste in search of succor.

In the books
In the Song of Ice and Fire novels the Red Waste is extremely large, taking weeks to cross, and is unrelentingly hostile. Water is scare and food sources almost non-existent. The wasteland is located east of Slaver's Bay and west of the Jade Sea and the city of Qarth. It's southern edge runs along the Summer Sea. There are ruins in the waste, suggesting that at one time it was much more pleasant and habitable than now.