The Sea of Irkalla (pronounced er-CAH-la) is a major underground body of water under Ishtar, within the massive Depths cavern of Kur. The shoreline around the sea is relatively narrow, only a few dozen miles wide in most places and hotly contested by the various inhabitants of Kur. Archipelagos of small islands, some natural and some artificial, dot the sea. The Kirak River that begins in the Zakros Range provides fresh water from the surface to the sea, as do a number of smaller rivers that flow underground through cave systems. Sightless creatures, including bony fish, giant squids, and others, dwell within the pitch black waters of the sea - despite the rough conditions in Kur for those that cannot reside in the water, the inky depths are teeming with life. Most of these creatures, however, are best avoided.
The islands within Irkalla are refuges from the dangers of its shores, home to small communities of munavri, caligni, and fetchlings. Around the sea live xulgaths, deros, morlocks, and others, who constantly attempt to expand their territory and subjugate their neighbors.