Aerth, or A-er-Tha, translates from draconic language as "One-who-Changes". Rephrasing, Aerth means "a Changing World".
If one would manage to observe Aerth from its orbit, he would find a world not very different from any other. Three continents are divided by inner sea and surrounded by great water expanse which is clouded by everlasting storms. Northern, the smallest of the three, is covered in thick greenery with an exception of southern coast, where lies a lifeless desert. Dividing the continent roughly in two, a great mountain range goes from northern reaches down south, into inner sea.
Two big continents are so similar in appearance they could be called mirrors of each other. Eastern and Western so-called Twins. Climate zones of Twins range from great savannas on the north-east and north-west respectively and to freezing tundra in the south.
Inner sea is always shrouded by thick gray clouds - signs of unceasing volcanic activity. Eruptions and earthquakes