Mount Sinai (also known as Mount Horeb or Gabal Musa) is a mountain in the Sinai penisula of Egypt. It is considered as a holy site in the Abrahamic religions, as well as being the subject of the Biblical narrative, The Ten Commandments, told in the Book of Exodus. Particularly, Moses received the Ten Commandments, a set of biblical principles relating to ethics and worship, which played a fundamental role in Judaism and Christianity.
As such, the narrative passed on as a source material to modern fictional works, including the Dreamworks' animated feature film, The Prince of Egypt, where it was featured at the very end of the film, after Moses and the Hebrews escaped from the Egyptian empire.
Regarding the villain tournaments, Mount Sinai appears as one of the main locations of Heroes vs. Villains War with the footage of the location taken from The Prince of Egypt, where it is featured as the refuge of Moses and Aladdin's group of heroes, extending later as the base of the assembled hero forces.