Prepare to have your mind blown

[RolandDebreton]

Is it really accessible outside the echo, and if so where is it on the map?

Mor Dhona head 6, 15, you'll see a little finger of land heading north by north west. As you curve down it will take you under the landmass of 6, 14 and back around to 7, 15. Please be extraordinarily cautious, Smolenkos occupy the tunnel, they tend to be 80+ and are sight based. The site is a conal affair, use that to your advantage.