Upon approaching the Sea Fort, stationary cannons will begin firing at oncoming ships as an attempt to fend off attackers. An active Sea Fort is indicated by the raised flag, ghostly lights and ominous music on approach. Unlike other World Events, Sea Forts are always active provided that they have not recently been completed by a crew. 0-5 pulley systems containing three White Barrels each, which have higher drop rates for Pineapples, Ruby Splashtails, and animal Meat.1-2 Food Barrels containing a variety of fruit.1-3 Wood Barrels with around 15 Wooden Planks per barrel.2-4 Cannonball Barrels with 50 Cannonballs per barrel.Multiple Barrels with varying supplies.1 large Stove able to cook four items at once.1 Wall mounted Map Table in the Kitchen.Pulley systems for controlling a platform, some barrel lifts, and portcullis gates.Floor mounted hatches, and wall mounted window shutters.Large Floor-mounted cupboards with two doors.Special containers, which may be opened to occasionally reveal small treasure items or Gold Pouches.Miniature Cannons (Functionally equivalent to the Cannon mounted on Cannon Rowboats).Sea Forts accommodate many interactive mechanics and points of interest: These include a rowboat docking bay, living and food preparation spaces, sleeping quarters, and defence posts. The interior of the forts are split up into multiple different rooms of different uses to the previous inhabitants. The Shores of Plenty has a standard Spanish fort style, The Wilds has a chained down prison theme, while forts in The Ancient Isles are rundown and overgrown with flora. Sea Forts in each region come with a unique theme for their region.

There are six individual Sea Forts around the Sea of Thieves, two in each region except The Devil's Roar.

Blastaball sea of theives