Unlike adhesive in Soulmask, ice is very easy to find because there is only one giant area where you can get a ton of it.
To find ice in Soulmask, you should head to the northwest icy mountains. It is the top left corner of the map that is covered in white snow, which is one of the furthest regions of the map.
Exact Ice Location in Soulmask

Northwest icy mountains are rich in ice resources in Soulmask. When you visit this area, you can find ice scattered across the entire region.
Ice nodes are visible on the ground which are easily mined using a pickaxe.
I found that the best way to farm ice in Soulmask is to activate portals. Trigger one near your base so you can easily haul ice between the mountain and your camp. This will allow you to quickly return after gathering ice.
While a basic pickaxe will do, but the higher the quality of your pickaxe the more ice you can farm in Soulmask.
When going to the icy mountains for the first time, I recommend using either a panther or Llama mount.
Where to Use Ice
Since we know how important food is to be maintaining a good mood in your camp, it is best to stop food from going bad. This is where ice comes in.
Ice is primarily used for creating an Ice Box, which functions as a medieval refrigerator to prevent food from spoiling.
To unlock the Ice Box in Soulmask, reach an Awareness Strength of 40 and use ice as fuel to keep their food fresh.