Bundahishn
Chapter XXII
On the nature of lakes it says in revelation, that thus many fountains of waters have come into notice, which they call lakes (var); counterparts of the eyes (kashm) of men are those fountains (kashmak) of waters; such as Lake Kêkast, Lake Sôvbar, Lake Khvârizem, Lake Frazdân, Lake Zarînmand, Lake Âsvast, Lake Husru, Lake Satavês, Lake Urvis.
I will mention them also a second time: Lake Kêkast is in Âtarô-pâtakân, warm is the water and opposed to harm, so that nothing whatever is living in it; and its source is connected with the wide-formed ocean.
Lake Sôvbar is in the upper district and country on the summit of the mountain of Tûs; as it says, that the Sûd-bâhar ('share of benefit') is propitious and good from which abounding liberality is produced.
Regarding Lake Khvârizem it says that excellent benefit is produced from it, that is, Arshisang the rich in wealth, the well-portioned with abounding pleasure.
Lake Frazdân is in Sagastân; they say, where a generous man, who is righteous, throws anything into it, it receives it; when not righteous, it throws it out again; its source also is connected with the wide-formed ocean.
Regarding Lake Âsvast it is declared that the undefiled water which it contains is always constantly flowing into the sea, so bright and copious that one might say that the sun had come into it and looked at Lake Âsvast, into that water which is requisite for restoring the dead in the renovation of the universe.
Lake (or, rather, Gulf) Satavês is that already written about, between the wide-formed ocean and the Pûtîk.
It is said that in Kamîndân is an abyss (zafar), from which everything they throw in always comes back, and it will not receive it unless alive (gânvar); when they throw a living creature into it, it carries it down; men say that a fountain from hell is in it.