Circle of Gryfnill - 6640, 3450
Port Scudra - 6559, 4133
Skarntinn Shelf - 4124, 2820
Temple of Aia - 3548, 3424
Can't see the portal at The Big Dig.. If anyone has some exact coordinates..
The Big Dig is at 3350, 4395, facing [jumping to] to the peninsula at 3401, 4426. The portal that you have to jump through is a bit delayed on rendering, so give it a moment to see it appear.
Thank you! Found it at 3384, 4413. I could see the portal and the landing spot from below.. weird that I didn't see it before, even though I've been literally combing the snow for days :/
For The Big Dig, go to Farv at around 3100, 4200. Head SW and around to the back side of the hill SE of there to 3351, 4375. Face SSE and jump to the ledge. I dismounted and slid slightly to the left. If you go too far you will fall. Jump to the second ledge. Face the end of the ice peninsula below and jump through the circle to land on the end of the peninsula.