In God of War Ragnarök, the Odin's Raven in Radsvinn's Rig is one of the Ravens that can be claimed during your first visit to Svartalfheim. Here's where you need to go to find it.
Luckily, the Odin's Raven in Radsvinn's Rig is near the Nornir chest also located in the area. Radsvinn's Rig is on the same island as The Watchtower, where another Raven can be found. These are two of the 13 that can be found in Svartalfheim, so you'll be able to claim several in a row as you go through the area. Radsvinn's Rig is a required area for the 'In Service of Asgard' quest, so you can also claim the Raven as you complete the quest.
Where to Find Odin's Raven in Radsvinn’s Rig
Once you've reached The Watchtower, travel to the far right of the island to reach Radsvinn's Rig. From there, look for the Nornir chest, which is to the left of the mining rig in the area. Once you've located it, look up and to the left, and you'll be facing the Raven. It will be sitting motionless on the hook of a large crane, which will make claiming it relatively easy.
If you miss any of the Ravens found on the island during your first visit, they can be claimed at any point of the game, like all the others.