-The Ebissian Sea used to be smaller, and contained more isles and islands, many of them rather large. When the Achaean civilisation – which called these waters their home – fell catastrophically, the land was broken and the sea rushed in, sinking many of those islands and eroding the coastline. The Broken Beach and the Shattered Shore are two of the remnants of this apocalypse.
The Shattered Shore is the name used by the local Fey for the entire western coastline of Eastern Landmass™, where it meets the Ebissian Sea. This region is jagged and "shattered", and accompanied by a myriad of isles and boulders too small to be added to a map. Its counterpart is the Broken Beach, and they share a lot of similarities.