The Hydra is a massive river basin in central Xen'Drik. With head waters in Fangs of Argarak and the mountain ranges that line the northern edge of the Valley of Shadow the Hydra delves deep into the interior of Xen'Drik.
The mouth of the Hydra is easily reached by water taxis from Stormreach where passengers, cargo and crew transfer to or from the slow moving river barges that traverse the waters of the Hydra.
The ancient ruins of Thrakgun Dahk and Pra'Xirek already been discovered directly along the waters of the Hydra. The Pyramid of the Ebon Flame, Ring of Storms, and Bazek Mohl are other know ruins with the Hydra basin.