just randomly glue few levels geometry
and make the boat go through it
how about driving a boat through the burning gaul village
you want it to drive on land or what?
you chop off the village from gaul and import it where you need
and boom you are sailing through a burning gaul village
or a better thing would be to take greece
and like upper the level of water in baths
so you drive boat in baths and near pier why not
edit existing geometry and import it where the boat ride is
there is no greece in helvetia tho
like anything else makes sense there