The Nether in Minecraft: building a portal and its dangers
Contents
The factual base for this piece comes from two pages on the community-run Minecraft Wiki — Nether Portal and Nether — plus the official Mojang article Nether Update out today on Java on Minecraft.net.
How to build a portal
- Minimum frame size — 4×5 blocks of obsidian; corner blocks in the frame aren’t required, so the smallest working portal actually needs 10 blocks of obsidian.
- Maximum size — 23×23 blocks.
- Activation. The portal is lit by fire inside the frame — flint and steel, a fire charge, a fireball, lightning, or fire spreading naturally. The method used doesn’t affect where the portal leads — only whether it lights at all.
Coordinates: how the two worlds connect
One block of travel in the Nether equals 8 blocks in the Overworld. This is an officially documented ratio, and it’s exactly why experienced players build portals in the Nether specifically for fast travel across the main world: a trip that would take thousands of blocks on foot shrinks by a factor of ten in the Nether.
The main dangers of the Nether
The Nether is a dimension with its own set of threats that don’t exist in this form in the Overworld.
- Lava spreads differently. In the Nether, lava spreads twice as far (eight blocks) and three times faster than in the Overworld — a careless step near a lava lake here is punished faster.
- Sleeping is lethal. Trying to sleep in the Nether or the End causes an explosion with a power of 5 — stronger than a TNT explosion (power 4). A bed in the Nether isn’t a place to rest; it’s a way to blow yourself up.
- Hostile mobs of a different kind. Ghasts, piglins, hoglins, and piglin brutes in bastions — a mob set unique to the Nether, none of which appear in this concentration in the Overworld.
- No landmarks. The Nether’s terrain is harder to navigate without a map — vertical caves, lava seas, and the lack of a day cycle throw off your sense of direction faster than the surface world does.
What the Nether Update added
The official Minecraft.net article about the Nether Update confirms: the full update for Java Edition launched on 23 June 2020. That’s when the game added netherite, piglins, hoglins, ruined portals, bastions, respawn anchors, and new Nether biomes (warped and crimson forests, basalt deltas, soul sand valleys, among others). Before that update, the Nether was a far less detailed dimension, without these structures and mobs.
What’s officially not said
- The exact probability of encountering a specific hostile mob at a given distance from a portal isn’t given as a single official figure — it depends on the Nether biome and spawn randomness. That’s why this piece doesn’t include made-up percentages on the topic.
- An “optimal” portal network for fast travel is community advice, not an officially documented mechanic, and it’s deliberately not presented here as fact.
What to do after your first portal
The main practical reason to go into the Nether isn’t the portal itself — it’s resources that don’t exist in the Overworld: gold for trading with piglins and, deeper down, Ancient Debris for upgrading to netherite. Before your first trip, it’s worth having a food supply and at least iron armor — and remembering that any trading with villagers for gold happens after you’re back home.
Frequently asked questions
How much obsidian do you need for a Nether portal?
The minimum frame is 4×5 blocks, and corner blocks aren't required, so a working portal actually needs 10 obsidian blocks. The maximum frame size is 23×23 blocks.
What can you use to light a portal?
According to the Minecraft Wiki, a portal is activated by fire inside the frame: flint and steel, a fire charge, a fireball, lightning, or fire spreading naturally.
Why can't you sleep in the Nether?
Trying to sleep in the Nether or the End causes an explosion with a power of 5 — stronger than a TNT explosion, which has a power of 4. This is an officially documented mechanic, not a rumor.
How do Nether coordinates relate to the Overworld?
One block of travel in the Nether equals 8 blocks in the Overworld. This means portals can be used to travel long distances across the main world quickly.
When did netherite and the updated Nether appear in the game?
The Nether Update for Java Edition launched on 23 June 2020 — that's when netherite, piglins, and bastions were added.