The Great Electro-Barrier Reef is an underwater hazard seen in Konami's 1989 NES and LCD handheld video games. It is a coral reef which can shock the Ninja Turtles upon contact
In the NES game, the reef is interspersed with Turtle-eating seaweed and Pizza/Turtle Cutters in the Hudson River stage, where the Turtles must dodge them both in order to disarm the bombs that have been set to blow up the dam.