Enter your world seed into the interactive seed-map finder on this page to get the exact coordinates of every Bastion Remnant in the Nether before you even load the world. In-game, Bastion Remnants are large Blackstone structures that generate randomly throughout the Nether, so the map is by far the fastest way to locate one without wandering.
Bastion Remnants only generate in the Nether, in any biome except Basalt Deltas. The Nether is split into regions (432x432 blocks in Java, 480x480 in Bedrock) that each contain either a Bastion or a Nether Fortress; in Java a bastion has a 60% chance over a fortress (about 66% in Bedrock), and because each region holds only one of the two, no region ever contains both a bastion and a fortress.
Bastions come in four equally common variants (Bridge, Hoglin Stable, Housing Units, and Treasure) guarded by Piglins, Piglin Brutes, and Hoglins, with the Treasure variant holding the best loot. Chests can contain ancient debris, netherite scrap and ingots, the Netherite Upgrade smithing template, gilded blackstone, and gold; wearing any gold armor keeps regular Piglins neutral, but Piglin Brutes always stay hostile.
