Neoforge Mods for Minecraft 1.21
Browse 53 free Neoforge mods for Minecraft 1.21 — popular picks include YUNG's Better Caves (Forge/NeoForge), Aquamirae, Ocean Floor - Clay Sand and Dirt.
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YUNG's Better Caves (Forge/NeoForge)
Overhauled cave generation, underground lakes and rivers, lava oceans, and more!
Aquamirae
Ship graveyard with terrible deep sea creatures!
Ocean Floor - Clay Sand and Dirt
Spawns patches of Clay, Sand, and Dirt, within the Deep Dcean layer of boring gravel
Underwater Village - Oceanic Structures
Discover a lot of new oceanic structures!
FTB OceanBlock 2
Nothing but endless ocean. No land. No rescue. You’re alone - or so you think...
Ocean World Dimension
Explore an endless ocean in the Deep Sea dimension!
Aquatic Additions
Aquatic Additions completes the vanilla turtle armor and adds an upgraded version to enhance underwater exploration
Create: Stranded at Sea
An ocean survival, centered around create automation, adventure, and a fully integrated economy system.
Unnamed Sea
Additional structures for the sea and beach biomes, focusing on an immersive expansion for the vanilla game.
[HUGE UPDATE] Fisherman's Haven
A huge expansion for fishing and ocean exploration in Minecraft!
Sky Archipelago
Sky Archipelago adds a new floating-islands world generation. High degree of configurability, such as island density, sizes, Y-spawn heights, ocean or void and much much more!
Aetherial Islands
Datapack that creates a whimsical floating islands world, with mountains, rivers, and floating ocean bowls!
One Survival Island
Datapack that creates a Single Survival Island in an Infinite Ocean World
Better Cave Worlds
Datapack that creates Cave Worlds, based on the old preset, featuring all biomes, ocean caves, and most structures.
Revamped Floating Islands
Datapack that creates Floating Island worlds based on the old preset, with all biomes and structures. Additionally featuring floating oceans and rivers.
No More Ocean Monuments
Removes ocean monuments from the world generation.
Temperature Bands
Modifies world generation to place biomes into repeating temperature bands. Compatible with most worldgen mods. Now with humidity based on proximity to river and/or ocean too!

Deep Waters
mermaids dimension

Fish Fix
Amends hardcoded sea level assumptions to fix aquatic mob spawning.
Unlocked Void Sea - Aeronautics Addon
A simple utility mod that lets you use the "End Sea" physics from Create: Aeronautics in other dimensions. Extremely configurable.
Over the Sea | Underwater Adventures!
Facing new aquatic dangers in a world made up entirely of water and small islands floating on it.
Scuba Diving Suit
Scuba Gear adds a functional diving suit designed for underwater exploration, explore the ocean with confort in a vanilla way.
Repurposed Structures - Better Ocean Monuments Compat Port
TelepathicGrunt’s Repurposed Structures - Better Ocean Monuments Compat Datapack ported to Forge, NeoForge, Fabric and Quilt!
Hybrid Aquatic: Fantastic Fishery
An addon for Hybrid Aquatic that adds various imaginary fish
Beyond The Ocean
A Mod that let´s you explore beyond the oceans of minecraft. New ocean themed planets on a post End level difficulty. New structures, mobs, items and technologies. New adventures and a new story ready to be told.
More Aeronautics Void Seas
Makes the Create Aeronautics End Sea spawn in the other two dimensions.
End Sea Everywhere
Bare bones datapack that adds the End Sea from create simulated to other dimensions. Useful for Skyblock style modpacks.
Aquatic Fauna Expansion
A NeoForge mod that revitalizes Minecraft's oceans with new creatures, behaviors, and underwater biodiversity.
Aquatica
Aquatica is a Modpack that contains 400+ Mods, and is primarly focus on Create.
Simple Submarines
Adds submarines for underwater exploration.
Kreyc's Waterworld
Custom Modpack, where most things are underwater. If you have phobia and/or afraid of being underwater, this pack is most likely NOT for you. But if you are like me; halv fish, then welcome and enjoy!
better mob : sea expansion
Better Mob: Sea Expansion transforms Minecraft oceans with unique creatures like Whales, Lobsters, Deep Watchers, Coral Golems, and Jellyfish, creating deeper exploration, dangerous encounters, and unforgettable underwater adventures.
SharkSquad - True Survivors
Survive against Titans in the apocalypse!
Aquatic Creatures
Did you know we know most about the space than own ours oceans? I want to make you feel that with this mod
Lava Gen Tweaks
Tweak the base sea level for lava! Typically starts at -54.
Eternal Ocean
An ocean world with creatable ships along with many new fishes and other creatures. Swimming and fishing are overhauled, along with plenty of new structures and biomes to explore.