Why did Kratos Burn his Wife on Land

Traditionally Vikings dispose of bodies by putting them on a boat, then putting the boat on a river/lake and burning them, but I’m wondering why Kratos didn’t do that. I tried looking it up on google and could not find anything so here I am on Reddit. And I know it’s not a distance problem like they’re right next to a river I don’t understand why they didn’t do it the traditional way.

Traditionally Vikings dispose of bodies by putting them on a boat, then putting the boat on a river/lake and burning them, but I’m wondering why Kratos didn’t do that. I tried looking it up on google and could not find anything so here I am on Reddit. And I know it’s not a distance problem like they’re right next to a river I don’t understand why they didn’t do it the traditional way.