Noah's Ark

A ship large enough to hold 7 of each 'clean' species and 2 of each 'unclean' species, along with enough food and water for 40 days. Assuming that God did not make it dimensionally transcendent, it would have had to be very large.

How fresh-water fish (who can't survive in salt water) and land vegetation (which would have drowned, then been left in salt-poisoned soil) escaped the effects of the Flood is not explained.