A few weeks ago I revisited the size of Westeros and was able to come up with individual figures for the distinct regions of the continent.
In this entry I do the same for the three continents, namely Essos, Sothoryos and Ulthos. My previous article on the same subject from four years ago can be found here.
The values for the regions are as follows. Note that these are a bit more approximate than the regions of Westeros because region borders in Essos are not as firmly delineated:
Essos: 12,193,620 miles² (mainland only)
The Free Cities: 1,507,479 miles²
The Stepstones: 9,817 miles² (all islands)
The Dothraki Sea: 2,435,820 miles²
The Red Waste: 455,528 miles²
The Isle of Cedars: 6,207 miles²
Ghaen: 8,311 miles² (all islands)
Lhazar: 218,750 miles²
Great Moraq: 236,311 miles²
The Golden Empire of Yi Ti: 1,745,162 miles²
Leng: 77,507 miles²
Plains of the Jogos Nhai: 737,957 miles²
Ib: 147,301 miles² (Ib), 16,657 miles² (Far Ib), 172,303 miles² (all islands total)
The Shadow Lands: 566,985 miles²
Naath: 8,022 miles²
The Summer Islands: 40,797 miles² (Walano), 32,085 miles² (Omboru), 112,733 miles² (Jhala), 205,038 miles² (all islands combined)
Valyra: 197,332 miles² (Lands of the Long Summer), 41,195 miles² (Valyria Island), 289,823 miles² (mainland and all islands)
Ulthos: 360,088 miles² (mapped portion only)
Sothoryos: 1,341,108 miles² (mapped portion only)
To contrast with real-world equivalents, the mapped portion of Essos is slightly larger than Africa (11,730,000 miles²) but significantly smaller than Asia (17,212,000 miles²) or Eurasia (21,000,000 miles²). George R.R. Martin has said that Essos is approximately the same size as Eurasia, suggesting the unmapped portion of Essos may be around 9 million miles² in size.
The Golden Empire of Yi Ti is just under two-thirds of the size of its inspiration, China (3,705,407 miles²).
The largest island in the Known World is Great Moraq, although it is significantly smaller than the real world’s largest island of Greenland (836,330 miles²).