Liu Kang and Sub-Zero defend themselves against the siege of undead Bloody Skeletons at the Sea of Blood
The Sea of Blood is a dangerous place found near the Wastelands in the Realm of Outworld.
This entire lake was filled with blood. The souls of the dead that are there are put to use with their bodies added to the sea of the blood of the damned.
Those that traveled the sea through boat were often challenged by bloody Undead skeletons that boarded their craft and attempted to kill the living.
During their quest in Mortal Kombat: Shaolin Monks, Liu Kang and Kung Lao traveled across it with the younger Sub-Zero.