From Tar Valon Library
A similar entry appears in the Wheel of Time Companion. Other information about the character is also included in the Companion, but we did not use it in the TarValon.Net Library.
Arran Head is an area between Altara and Illian. There is a hundred leagues of open water, known as Kabal Deep between Aran Head and the city of Illian, with a two hundred mile march to avoid it
(Reference: The Path of Daggers, Chapter 14)