Of course it is, but you don't have to take my word for it; just consider the evidence:
FACT: Ferdinand Magellan, the first man to attempt the circumnavigation of the Earth, sailed from Spain in 1519 and was never seen again.
FACT: If you try to wrap a paper map around a sphere, you have to distort the shape of the continents to make it fit.
FACT: You know who else said the Earth was round? Hitler, that's who.
Wake up, sheeple!
Ah, but waves are not flat now are they, and Magellan had to sail quite a few of those did he not?
"Waves" are caused by movement on the ocean floor, which causes the mass displacement of "water" via the "butterfly effect." The larger the movement, the bigger the "wave"; hence why "storms" are more common in areas with large populations of "sea monsters."
In the late 1960's, early 1970's, astronauts on the moon took some photos to check the shape of the Earth.
Spherical apparently.
This is a well-documented optical illusion.