ネザーゲート
A manufactured structure that acts as a gateway between the Overworld and [[the Nether (minecraft)|]] dimensions. A Nether portal is built as a vertical, rectangular frame of [[obsidian rock]] (4×5 minimum, 23×23 maximum size). The four corners of the frame are not required. Once a frame is constructed, it is activated by fire placed inside the frame. This creates purple, light-emitting portal blocks inside the frame, resembling a vortex. It produces whooshing noise regularly. 
Such incomplete frames of obsidian are often found in naturally-generated ruined portal structures.

It can be destroyed by [[explosion]]s, flowing [[lava|lava]] or [[water]] into the portal block or by simply [[mining]] its obsidian frame.

There are also rumors about [[aether portal|a variant of this portal using glowstone and water]]…
nether portal