The Endless Sea (also known as the Endless Ocean or the Great Ocean) is the sea that surrounds every island and landmass in the world of Ninjago. The sea existed long before the First Spinjitzu Master created the land of Ninjago, and that was where Wojira ruled with the full power of Wave and Storm. Wojira was then defeated by Nyad and a few millennia later she was defeated by Nya. Because of this, they both had to merge with the sea.
The Endless Sea features many fish and other water creatures, including eels, jellyfish, sharks, Ripper Sharks, whales, manta rays, starteeth, Leviathans, fangfish and Wojira. It also used to be a safe haven for pirates, including Captain Soto and Nadakhan.
The depth of the sea varies drastically. At some points, the water is shallow enough to reach the bottom in a moment. Other areas such as Hollow's Trench are deep enough to sink creatures as large as the Preeminent. The Tartarus Trench is the deepest point in the sea. Near the trench, there is an underwater kingdom of Merlopia.
Prior to the series
After leaving from the Realm of Oni and Dragons, the First Spinjitzu Master went to find a new home. Once he did, he found a Realm of a vast ocean that was inhabited by a sea spirit named Wojira, who used her amulets to plunge the world into unending chaos with complete control of the Endless Sea and the violent thunderstorms plaguing it. Allying with Nyad, the first Elemental Master of Water, the First Spinjitzu Master lead an alliance of the Merlopians and the islanders to battle against Wojira that lasted for nine days straight. Making a final stand on the ninth day, Nyad merged herself with the Endless Sea to pry the two amulets from Wojira's head, causing her to fall into a deep sleep while the Endless Sea became calm and peaceful for thousands of years.
Upon waking up, the ninja and Wu did some stretches while sailing the Endless Sea. When Wu realized his students weren't paying attention, he had them train until they could solve his riddle. When there was trouble at Darkley's, the group left the sea.
Zane tests his breath-holding record at the bottom of the sea.
Lord Garmadon and the four remaining Serpentine generals fly over the Endless Sea to try to find the Dark Island. After searching all day, Skales pushes Garmadon into the ocean so he can become the new Serpentine leader.
The ninja used their Elemental Powers next to the Endless Sea's shore. Later, the ninja fell down the cliff, splashing in the sea.
The Stone Army reached the coast in order to fire Dark Matter in Ninjago.
With no way off the island, Kai suggests they swim but backed out after the water reached his chest.
When Lloyd reaches the cliff, the Overlord forces him to stay or Garmadon will be dropped into the sea. He had Wu drop him anyway, as he's of no use to them.
The Nindroid MechDragon plunges into the sea, where the Overlord emerges as a physical form.
In the sea, Pythor and the Nindroids swam toward the MechDragon, where the Overlord is located.
After traveling across the sea, the Elemental Masters arrived at the island.
Nya, along with Dareth, secretly boarded Chen's ferry to find the ninja.
Dareth was captured by the Anacondrai Cultists when he almost fell into the sea.
Chen's blimp flew over the Endless Sea to fly above the island, where the remaining Elemental Masters have to find Nya.
The Elemental Masters flew over the sea to reach Ninjago Island.
In a dream, Kai tells Lloyd he'll take care of him right before a Fangfish jumped out of the ocean and subsequently devours the latter.
Hoping to find Ronin, the ninja arrived on the docks, where a fisherman is pulled into the sea. Later, the ninja help complete the dock but didn't get paid when they ruined it.
Kai chased Morro to the sea for the scroll, and had to be picked up by Ronin.
The ninja traversed under the sea using R.E.X. to reach the tomb. Meanwhile, Wu, Misako, and Nya landed the Bounty above the tomb's location, with Soul Archer and Bansha not far away.
Lloyd commanded the ninja take out Stiix's support beams to drop the Preeminent into the sea. When the Ghost Warriors supported her by surrounding her with houses, the Preeminent chased everyone to Hollow's Trench, destroying her.
Near the sea's shores, Nadakhan used the Realm Crystal to bring back his crew.
Later, Captain Soto told the ninja about trapping the Djinn during their fight on the sea.
After Lloyd and Cole flew over the sea on their Dragons, they failed to find the Misfortune's Keep on Gypsy Cove. They assumed it was repaired and took off to sea.
The remaining ninja built a raft to get off Tiger Widow Island. It starts to break apart, but Ronin and the detectives rescued them after realizing that the ninja are not criminals.
Jay and Nya made the Hydroelectric Dragon before they could fall into the sea.
Prior to The Island
While helping the Ninjago City Police capture the ecapsed Kryptarium inmates, Ronin soon realised he could use the escaped inmates as a way to get more money. So he and his criminal group sailed the Endless Sea and travel to the Island of the Keepers. By using a boat that resembled Wojira to travel to the island, Ronin and the escaped criminals tricked the Keepers into giving them their money and resources every week.
While trying to find Wojira's resting place, Kalmaar discovered that Wojira was in a temple at the Tartarus Trench and told his father about it, but was forbidden to go there by his father. Ignoring his father, Kalmar got Benthomaar to swim through there by tricking him that he wanted to make a fresh start.
Once they went to the Tartarus Trench, Benthomaar and Kalmaar swam passed the vents and eels and made it to the Temple of Wojira. However, Kalmaar revealed to him that all he said before was a lie and told him to go. Eventually, Kalmaar later stole the Wave Amulet from the other Merlopians, allowing Wojira to regain possession of it.
When Jay was about to "Wojira", Zane made an ice bridge so the ninja could cross the Endless Sea and fight off the monster.
Nya merges with the Endless Sea as Nyad did before her to draw out the sea water from Jay's lungs, as well as to fight Wojira.
After defeating Wojira, Nya (in her NRG water form) says goodbye to the ninja and dives into the ocean. Later on, she is seen happily swimming alongside some whales.
Islands and mainlands
- Chen's Island
- Dark Island
- Dyer Island
- Glacial Glacier
- Island of the Keepers
- Lighthouse Island
- Squawk Island
- Tiger Widow Island
- King Benthomaar
- Wojira (formerly)
- Nya (formerly)
- Giant sea turtles
- Manta rays
- The Endless Sea caused the demise of multiple characters.
- Deepstone is found and mined at the bottom of the sea.
- The name suggests that Ninjago and the Dark Island, apart from smaller islands scattered around, are the only landmasses on the planet.
- According to Tommy Andreasen, the Police Commissioner, Tommy, and Simon were able to get back to Ninjago and escape the sharks from "The Last Resort" with the help of giant sea turtles in the Endless Sea.
- The King of Merlopia is also known as the ruler of the Endless Sea, which means that Merlopia claims control of the entire ocean, not just the territory where most Merlopians live.