i doubt someone like him has the physical conditioning to actually swim across any lake.

Lake Natron in Tanzania

lava lake

Lake of fire

One of those methane lakes on Io.

He daily waddles across the lake of shit in his nappy

Nyos

https://en.wikipedia.org/wiki/Lake_Nyos

I once heard a poet say that when bad folks die they go to a lake of fire and fry. That seems like a good option.