A mod that allows you to build a boat in rivers and once built you can travel up and down rivers, the larger the boat/tech the faster you will be able to travel or the more pawns on a boat, the faster you will travel down.
to build a boat the map will have to contain at 5 vertical tiles and 3 horizontal tiles of deep moving water, or maybe less than that. Events such as dried river beds can stop your travel and so you have to uninstall your boat which will take you a couple of in game hours or days. another event can be a fortified settlement that depend on raiding travelling boats, or maybe even another boat ramming you.
If an event does trigger the map will be mostly consisting of water with your boat and other structures relevant to the event.
You can also raid factions built on rivers or next to the coasts allowing coastal bases to be raided from the shores.
to build a boat the map will have to contain at 5 vertical tiles and 3 horizontal tiles of deep moving water, or maybe less than that. Events such as dried river beds can stop your travel and so you have to uninstall your boat which will take you a couple of in game hours or days. another event can be a fortified settlement that depend on raiding travelling boats, or maybe even another boat ramming you.
If an event does trigger the map will be mostly consisting of water with your boat and other structures relevant to the event.
You can also raid factions built on rivers or next to the coasts allowing coastal bases to be raided from the shores.