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Nether Portal Guide - Build, Link & Travel | Minecraft 1.21 | MinecraftBible
Complete guide to Nether Portals in Minecraft. Learn how to build portals, link them correctly, calculate coordinates, and master inter-dimensional travel.
Understanding Nether Portals
Nether Portals are your gateway to the dangerous but resource-rich Nether dimension . This guide covers everything from building your first portal to creating complex portal networks for efficient travel.
Materials Required
Minimum: 10 Obsidian blocks (corners not required)
Standard: 14 Obsidian blocks (full frame with corners)
1 Flint and Steel or fire source
Obtaining Obsidian
Obsidian forms when water touches a lava source block. Methods to obtain it:
Diamond Pickaxe Mining - Find natural obsidian or create it by pouring water on lava lakes
Speedrun Method - Use a bucket to place lava, then water, without a diamond pickaxe (slower but no diamond required)
End Portal Frames - The End has abundant obsidian pillars
Building the Frame
The portal frame must be:
Minimum 4 wide × 5 tall (interior space: 2×3)
Maximum 23 wide × 23 tall
Made entirely of Obsidian
Standard Portal (10 obsidian - no corners): [O] [O] [O] [O] [O] [O] [O] [O] [O] [O] O = Obsidian
Portal Linking & Coordinates
This is where most players get confused. Here's how portal linking actually works:
The 1:8 Ratio
Every 1 block in the Nether equals 8 blocks in the Overworld.
This means:
Walking 100 blocks in the Nether = traveling 800 blocks in the Overworld
To find your Nether coordinates: Overworld X/8, Overworld Z/8
Y coordinates don't follow this ratio
Preventing Portal Mishaps
To ensure portals link correctly:
Build your Nether portal at the EXACT calculated coordinates
Keep Y-level similar in both dimensions
Light the Nether-side portal manually (don't just walk through)
Space portals at least 128 blocks apart in the Overworld
Building Portal Networks
Advanced players use portal networks for fast travel. Here's how to set up an efficient network:
Hub Design
Build a central hub in the Nether at Y: 100+ (above lava lakes)
Connect portals via Nether Brick tunnels
Light paths with Shroomlights or Lanterns
Use Lodestones and compasses to mark destinations
Surviving the Nether
The Nether is dangerous. Prepare properly:
Essential Gear
Full Diamond or Netherite armor
Gold boots for Piglins (they won't attack)
Fire Resistance potions
Plenty of Cobblestone for building
Backup Flint and Steel
Hostile Mobs
Ghasts - Deflect fireballs to defeat them
Blazes - Found in fortresses, drop Blaze Rods
Wither Skeletons - Drop skulls for the Wither
Piglin Brutes - Always hostile, found in bastions
Valuable Nether Resources
The Nether contains unique resources essential for progression:
Related Guides
Ancient Debris Mining Guide
Finding Nether Fortresses
Bastion Remnant Guide