The Casabon River (pronounced CAH-sah-bon) is a river in Viridia. The river begins in the northern Pike Mountains before flowing northeast into the Phiora Sea. At the mouth of the river it splits into a small delta. The Casabon River serves as the border between the Viridian provinces of Casabon, which takes its name from the river, and Andera.
Historically the river was used by the Tumunzari dwarves to carry their goods out to the Phiora Sea, after which they would sail to Razgovir (modern day Izgrev and Koritan) to trade. After their absorption into the Dominion, however, much of this mercantile traffic began to move into the Bay of Ertan instead. Today the river remains an important route of travel for the small farming communities of interior Viridia.