Bundahishn
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 Kekast, Lake Sôvbar, Lake Khvârizem, Lake Frazdân, Lake Zarinmand, Lake Asvast, Lake Husru, Lake Sataves, 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. 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. 6. Lake Zarinmand is in Hamadan.
Regarding Lake Åsvast 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 Asvast, into that water which is requisite for restoring the dead in the renovation of the universe.
Lake Husru' is within fifty b leagues (parasang) of Lake Kêkast.
Lake (or, rather, Gulf) Sataves' is that already written about, between the wide-formed ocean and the Pûtik. It is said that in Kamindan 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.
Lake Urvis is on Hugar the lofty.