Briny Grotto

 is a location in. It is located on the Ofecchia Channel, in the northeastern-most corner of the world map, at the coordinates 4° 58' S, 67° 37' E.

Points of interest
A very small cave and "home" of Sigilmaster Auranic, a Vailian wizard commanding a number of powerful sigils. She is one of the four mega bosses.

Trivia

 * The internal location is called "Cave".
 * This is actually a subsection of Cignath Mór, with the viewport restricted to the bottom left section.