The term Serbonian Bog relates to the lake of Serbonis in Egypt, which by reason of the sand blowing into it had a deceptive appearance of being solid land, but was a bog.
The term Serbonian Bog relates to the lake of Serbonis ("Sirbonis " or"Serbon") in Egypt. Because sand blew onto it, the Serbonian Bog had a deceptive appearance of being solid land, but was a bog.