Sirenie

Sirenie is a Mannersian Island in the Biland Archipelago taken over by the Manners. It is a very minor Island and is only known from a map that Whalee created. Nothing is known about it and it is only mentioned once in all the books.

Hippo Story 4
There is an Eye of Akor named Sirienie mentioned. It is unknown if this Eye is connected to the Island at all.