raft

He went out rafting on the river.

The river went around, and the raft went around, and his luck all wound up, and he drowned, and he was gone.

Some islands, like the Maldives, spend billions building interconnected rafts that house apartments, schools, and restaurants that float above its drowned cities.

In that case, it makes sense to use a raft foundation a completely solid concrete slab that extends across the entire structure.