From BiblePortal Wikipedia

Ghilan [1]

A province of NW. Persia, between the SW. border of the Caspian Sea and the Elburz Mountains; is low-lying, swampy, and unhealthy towards the Caspian, but the rising ground to the S. is more salubrious; wild animals are numerous in the vast forests; the soil, where cleared, is fertile and well cultivated; the Caspian fisheries are valuable; the people are of Iranian descent, and speak a Persian dialect.