Rash River
The Rash River is a river in Rash where Irashi hid one of the three magic rubies.
First named in The Hungry Tiger of Oz, ch. 6
"One he hurled from the highest turret of the palace, another he flung into the Rash River and the last he buried somewhere in the garden," answered the Grand Vizier sadly.
Where this is
placed Beyond the desert worked out
read out of the chapters cited on this page, not stated in any one sentence of them
Hungry Tiger of Oz ch1 states Rash is 'a small pink Kingdom, in the southwestern country of Ev and directly across the Deadly Desert from the Fairyland of Oz.'