Shipwreck and ruined portal (for speedruns)
Java Edition 26.3. Checked with Seeder's engine on .
The shipwreck start. Find the map that will lead you to a buried treasure with iron and a heart of the sea. Now with a ruined portal included in the price.
Beached wrecks are marked if you prefer those, since you can loot them without swimming.

1 From spawn: a shipwreck 93 blocks south-east and a ruined portal 36 blocks south-east.
Seed1074557468761508
What X, Z Distance Shipwreck 96, 48 93 blocks Ruined PortalUndergroundAir pocket 48, 16 36 blocks Trial Chamber 160, 128 193 blocks VillagePlains village 16, -256 256 blocks Monument 288, 144 308 blocks Stronghold 1044, 980 1.4k blocks Spawn in a plains at 16, 0, around Y 66.

2 From spawn: a beached shipwreck 48 blocks east and a ruined portal 102 blocks south-east.
Seed887266562840117
What X, Z Distance ShipwreckBeached 48, 0 48 blocks Ruined PortalUndergroundAir pocket 64, 80 102 blocks Trial Chamber 0, 48 48 blocks Abandoned Camp -320, 64 326 blocks Trail Ruin -240, 256 351 blocks VillagePlains village 224, -272 352 blocks Stronghold 2164, 356 2.2k blocks Spawn in a taiga at 0, 0, around Y 66.

3 From spawn: a shipwreck 112 blocks north and a ruined portal 51 blocks north.
Seed719881852101585
What X, Z Distance Shipwreck 64, 16 112 blocks Ruined PortalOcean portal 48, 80 51 blocks Trail Ruin 64, 160 32 blocks Trial Chamber 64, 192 64 blocks IglooWith basement 352, 64 295 blocks VillageTaiga village 336, 272 308 blocks Stronghold 2004, -76 2.0k blocks Spawn in a snowy taiga at 64, 128, around Y 74.

4 From spawn: a shipwreck right there and a ruined portal 65 blocks north-west.
Seed662855608430780
What X, Z Distance Shipwreck 112, 64 20 blocks Ruined PortalOcean portal 48, 16 65 blocks Outpost 240, 256 242 blocks Trial Chamber 336, 256 310 blocks Abandoned Camp 224, 352 317 blocks Stronghold 436, -1484 1.6k blocks Spawn in a frozen ocean at 92, 64, around Y 50.

5 From spawn: a beached shipwreck 86 blocks east and a ruined portal 102 blocks north-east.
Seed253918772807666
What X, Z Distance ShipwreckBeached 80, 80 86 blocks Ruined PortalOcean portal 64, 32 102 blocks Trial Chamber 96, 64 107 blocks VillageSavanna village 64, 224 129 blocks Stronghold 36, 1604 1.5k blocks Spawn in a beach at 0, 112, around Y 66.

6 From spawn: a shipwreck 143 blocks north-east and a ruined portal 48 blocks north.
Seed150790707761055
What X, Z Distance Shipwreck 80, 32 143 blocks Ruined PortalUndergroundAir pocket 16, 112 48 blocks Trial Chamber 256, 96 248 blocks VillagePlains village -208, 288 258 blocks Trail Ruin 208, 384 295 blocks Stronghold -92, 1652 1.5k blocks Spawn in a forest at 16, 160, around Y 72.

7 From spawn: a shipwreck 107 blocks north-east and a ruined portal 148 blocks east.
Seed992439917676055
What X, Z Distance Shipwreck 64, 64 107 blocks Ruined PortalUndergroundAir pocket 112, 144 148 blocks VillageSnowy village -208, 192 193 blocks Trail Ruin 176, 224 236 blocks IglooWith basement 256, 304 346 blocks Trial Chamber 240, 336 352 blocks Stronghold -476, 1524 1.5k blocks Spawn in snowy plains at -32, 112, around Y 66.

8 From spawn: a shipwreck 129 blocks south-east and a ruined portal 45 blocks south-east.
Seed59908773697188
What X, Z Distance Shipwreck 64, 112 129 blocks Ruined Portal 32, 32 45 blocks Trial Chamber -288, 48 292 blocks Jungle Pyramid -272, -144 308 blocks Abandoned Camp -144, 304 336 blocks Stronghold -1276, -748 1.5k blocks Spawn in a savanna at 0, 0, around Y 72.

9 From spawn: a shipwreck 136 blocks south-east and a ruined portal 51 blocks east.
Seed839695448267121
What X, Z Distance Shipwreck 96, 128 136 blocks Ruined Portal 48, 16 51 blocks Trial Chamber 32, 0 45 blocks Monument 256, 256 340 blocks Stronghold -876, -1068 1.4k blocks Spawn in a birch forest at 0, 32, around Y 72.

10 From spawn: a shipwreck 115 blocks north-west and a giant ruined portal 91 blocks south-east.
Seed1282831805522879
What X, Z Distance Shipwreck -80, -96 115 blocks Ruined PortalGiantJungle portal 80, 32 91 blocks Jungle Pyramid 176, 80 195 blocks Monument -192, 272 368 blocks Desert Pyramid 96, 336 377 blocks Trial Chamber 192, 304 379 blocks Stronghold -1244, 1908 2.3k blocks Spawn in a jungle at 16, -32, around Y 66.
Need more?
These ten seeds are the best out of thousands I searched. Seeder can find as many as you like, given the right premises, with your own range and in your favourite version.
Search in the finderQuestions
What is a shipwreck?
A sunken or beached ship with up to three chests. Minecraft Wiki
Where's the buried treasure?
Open the map you will find and go to the red X. Look up on the wiki how to make sure you are in the right spot.