[mad_as_he$$]

Not the biggest by a long shot.

https://en.wikipedia.org/wiki/Martin_JRM_Mars#Specifications_.28JRM-3_Mars.29

[az_gila]

Not the biggest by a long shot.

https://en.wikipedia.org/wiki/Martin_JRM_Mars#Specifications_.28JRM-3_Mars.29

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Like the Spruce Goose the Mars is a water-only seaplane, not amphibious.

If you want to see a Mars up close, it just arrived at the EAA convention in Oshkosh, Wisconsin.