As everyone knows, it's impossible to get good island chain seeds post 1.18&+ due to the generation changes. They ALSO messed up the noise algorithm, so Large Biomes no longer just magnifies a seed you have-
Which makes finding large island chain worlds – or even good ocean worlds- impossible in large biome style
Furthermore- only mcseedmap.net can do it- mcseeder, doesn't have a option for Large Biomes- and every other seed finder that's talked about- is no longer on the web it seems.
Anyway, i've been hunting hard, and for about a week have had on a few computers and phones, a few tabs running searches using the mcseedmap.net seed finder- and found some good ones! Sometimes it did take millions of seeds searched thru to find some of these….
It also has been eye opening what you can no longer get-
[Example: Jungles aren't warm, so they CANNOT spawn against a warm ocean, only close to one- Only badlands and deserts get those -and I want a tropical paradise with coral reefs next to jungles naturally (without using World Painter to force it)]
Notes: All of these were searched on Java Minecraft.
I am adding a few non LB ones i happened to find- However, my main focus by FAR (because they are FAR more rare) is large biomes ones. NOTE: Even the best ones i've found so far, don't quite compare to the island generation of old (normal and LB)
Note 2: Please don;t stop hunting for these- Island seeds / MASSIVE Ocean seeds are still in demand!
ocean world with newer generation 3557401991
possible spawn in shallow water
https://mcseedmap.net/1.21.5-Java/lb/%203557401991%20#x=-3921&z=-1980&l=-5.3
19439853041 Java(normal size), jungle plains islands
https://mcseedmap.net/1.21.5-Java/19439853041%20#x=-555&z=419&l=-3
-4174010708127644340
176354121912
176354121912
6141798331085729557 LB
very large island, villages
https://mcseedmap.net/1.21.5-Java/lb/6141798331085729557#x=-157&z=373&l=-4.3
-5266273825584455359 lb
tiny desert island seed ; other islands with villagers a bit of distance away
https://mcseedmap.net/1.21.5-Java/lb/-5266273825584455359#x=-553&z=-1672&l=-4.3
-5935414049915786028 surrounded by mid islands, , LB
ocean spawn
7333286746669974077 lb
few diff oceans , on large jungle badlands island with villages
https://mcseedmap.net/1.21.5-Java/lb/7333286746669974077#x=5177&z=-877&l=-6.7
small Desert village Island spawn
2517359503821578982 LB
https://mcseedmap.net/1.21.5-Java/lb/2517359503821578982%20#x=1925&z=421&l=-3.3
7385148700357405523 LB
villager , plains stony shore island
-6532874991933920578 normal
multiple larger islands
6195128028407269272 normal size
many many mid islands
-2705695332123358352 Large Biomes,
tiny stony shore plains spawn island, GIANT mushroom islands, nearby stony shores, forested islands, many explore-able islands
https://mcseedmap.net/1.21.5-Java/lb/-2705695332123358352#x=-76&z=1600&l=-2.3
2430432786614410116 LB
forested islands
https://mcseedmap.net/1.21.5-Java/lb/2430432786614410116#x=1889&z=-2550&l=-5
-2524522012530555091 LB
https://mcseedmap.net/1.21.5-Java/lb/-2524522012530555091#x=-4578&z=-186&l=-5.5
jungle Island Stony shores island, multiple other small Islands
-3975441375031118456 LB
Ocean spawn , large mushroom island"continent"
-913236458320771159 LB
Very large island, nearby mushroom island
https://mcseedmap.net/1.21.5-Java/lb/-913236458320771159#x=367&z=-2065&l=-4.7
-3973100098686640356 LB
jungle mangrove swamp island, LARGE mushroom islands nearby , okay candidate
https://mcseedmap.net/1.21.5-Java/lb/-3973100098686640356#x=1657&z=-2107&l=-4.7
by dark_volter