Though this is speculation, Ninjago, and the Dark Island, are the only land masses in the world, which from the space view in Return of the Overlord, makes the planet look enormous. The Endless Ocean almost explains that the two islands are the only land masses on the planet.
http://lego.wikia.com/wiki/Ninjago_(world)
New listing LEGO Ninjago: Cole/Jay 2-in-1 Ninja Handbook by Penguin Books Ltd (Paperback,...
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Ninjago started off in 2011 with a pilot film and a wave of LEGO sets, focusing on the 4 Ninja's battles with the Skulkin army.
https://en.wikipedia.org/wiki/Lego_Ninjago
Although, this was intended to be the end of Ninjago, it continued in 2014 with Season 3: Rebooted as well as the sets, featuring a futuristic plot and the Ninja's battle with the Digital Overlord and his robotic Nindroid Army.
https://en.wikipedia.org/wiki/Lego_Ninjago
Cole: Ninja of Earth is a Ninjago book released in 2012, written by Greg Farshtey. The book describes the adventures Cole experiences to master earth and Spinjitzu.
http://lego.wikia.com/wiki/Cole:_Ninja_of_Earth
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The Island of Darkness is an island located on the right side of Ninjago. It is where the First Spinjitzu Master had banished the Overlord. After thousands of years, the island has sunk into the ocean. However, Lord Garmadon pulled four knobs and pulled it back up.
http://lego.wikia.com/wiki/Ninjago_(world)
There are several changes from the previous series. These include the removal of the Shogun and Bandits, and the introduction of the Skulkin, Serpentine, Stone Army, Nindroid Army, Anacondrai Cultists and Ghost Warriors.
https://en.wikipedia.org/wiki/Lego_Ninjago
A video game, entitled Lego Battles: Ninjago, was released on April 12, 2011, on the Nintendo DS. It is the sequel to the 2009 game Lego Battles and was developed by Hellbent Games and published by Warner Bros. Interactive Entertainment and TT Games.
https://en.wikipedia.org/wiki/Lego_Ninjago
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who wrote the book ninjago
Greg Farshtey wrote the book Ninjago.