Water
Water is typically considered as one of the basic terrains. Heroes can only travel on water covered terrain with a boat, but they can also walk across it if they can cast Water Walk spell or they wear Boots of Levitation, or fly over it if they can cast Fly or are wearing Angel Wings. The difference is, that only heroes on a boat can end their movement on water while water walking requires that they end their movement on dry land. It should be noted, that shroud on the water between two squares of dry land does not prevent hero from walking across it and mapping the shrouded are. However, the hero must be able to see both land squares.
Hero on a boat can also visit and pick up objects on water. While sailing on boat the hero can:
- gather Flotsam, which may provide
wood and/or 
gold - gather Sea Chests, which may provide gold or an treasure class artifact
- rescue a Shipwreck Survivor, who will always provide an artifact as a reward
- search Shipwrecks and Derelict Ships to fight guardians for gold and artifacts
- meet up with Mermaids for a luck bonus
- investigate Buoys and get better morale
- visit Sirens, which causes the hero to lose 30% (rounded down) of each stack in hero's army and gain experience equal to the health of the lost troops.
- go through one Whirlpool and end up in another.
- read Ocean bottles.
Almost all adventure map objects that are normally placed on dry land can be also be placed on water square and still function normally. The exceptions are Towns, Subterranean Gates and Monoliths, which can not function if visited with a boat.
Unlike movement on land, the speed of the creatures in the hero's army does not affect movement in a boat.