What is "gosan"

Usage examples of "gosan".

But, of all that I ever read, the increase which Eldred Danus writeth of in his De imperie Judaeorum in Aethiopia surmounteth, where he saith that in the field near to the Sabbatike river, called in old time Gosan, the ground is so fertile that every grain of barley growing doth yield an hundred kernels at the least unto the owner.