No, not Amaranthe. The "beach" you arrive at when you take the boot south of Central on the worldmap to drive over the sea to the area of the Luminous Order.
If you have the quest, it should automatically trigger the next step when you get to the area I showed in the screenshot.
Unless you're on android, you could send me your save file to Naughty-Netherpunch@web.de so that I could check if you have some sort of bug. The saves are in the www/save folder. I only need one .rpgsave file with the save slot number in which you have the issue.