Sometimes, a Nether Portal to the Overworld will spawn over a body of water.
A portal ready to be used. The entire portal is not shown, the bottom row is covered by the stairs and slabs.
Four Nether portals used as decoration.
The full and "economic" version of the portal in comparison.
A "full-frame" nether portal and an "economy" Nether portal.
The Nether portal's block being used in a minigame.
A render of the Nether portal.
An animated nether portal.