"My boat."

Translation: Η βάρκα μου.

[ArthurAzev4]

Can't I say "το πλοίο μου"?

[Paco_Escipion]

I wonder... I never know the difference, if there is any...

[Frances900805]

What about το καράβι μου...

[Petra784970]

Yes, that would be my question too

[GGosseyn]

I have the same question

[spdl79]

πλοίο is equivalent to ship, and βάρκα is a boat. There's a difference between them in both En and El, and that's that the boat/βάρκα is a smaller vessel which could fit on a ship/πλοίο. I never knew the difference between the two before learning Greek ;-)