Traveling from Brazil to Mexico Without Flying or Driving

It is not possible to travel between Brazil and Mexico without using air transport (or a ship). The two countries are separated by the Atlantic Ocean (Brazil) and the Caribbean Sea / Gulf of Mexico (Mexico), with the entire width of South and Central America in between. Overland routes would require crossing the Darién Gap—a roadless, lawless jungle between Colombia and Panama—which is impassable by conventional vehicle. The only realistic non-air options are:

• Freighter / cargo ship (rare, expensive, weeks-long).
• Cruise ship (seasonal repositioning voyages).

For all practical purposes, flying is the only viable method.