In Monster Hunter Rise, you’ll be given all kinds of quests including getting materials.
One of the materials you will need to gather early on in the game are raftshells.
Here’s how you can find raftshells (location) in MH Rise.
The location of raftshells in the Frost Islands map is shown in the map below.
They are marked by the green circles on the map, and they’re all within the water area.
From far, you should see an item glowing in green, and it’s located in the water.
As you get close, you should see “Unique Item: Oyster Bed”. Pick it up and you would have gathered at least 1 raftshell. Some may provide 2 or more raftshells.
Once you’ve found eight raftshells, the quest ends and you’ll return to Kamura Village.