Aelin-uial ~ The maze of lakes and fens formed where the River Aros met the Sirion, before it fell beneath the Andram. These were lands heavy with enchantment, both from the Girdle of Melian guarding Doriath to the north, but also from the power of Ulmo that was strong in Sirion's waters
(http://www.glyphweb.com/arda/maps/aelinuial.gif)