What are Sea Forts in Sea of Thieves?

gamepur.com:

A 2022 roadmap for Sea of Thieves detailed a number of planned features, which will be pushed out across four brand new seasons. These seasons will also include new cosmetics for the Plunder Pass and voyages that will move the main story of Sea of Thieves forward. The most exciting main addition for Season Six is the idea of Sea Forts, which you can find scattered around the Sea of Thieves map.

Sea Forts are described as mini raids by Rare. Skeleton Forts have existed in-game for quite a while, but they usually require multiple groups to form together. These new Sea Forts are designed to be completed in a small group, even as a solo player if you wish.

Season Six added six different Sea Forts for players to discover. These six forts come in three different themes; one such theme is prison-based, for example. Another theme will have the look and feel of abandoned ruins. The final theme will resemble a traditional Spanish Fort seen in previous updates.

These Sea Forts should add a meaningful experience for every level of player, especially for new players who are looking for quick PvE encounters and hauls of loot. And on top of that, clearing out a Sea Fort will let you hold the territory as your own fortress — just be ready to defend it as fervently.