Kingdom Builder: Marshlands, is the third boxed expansion for Kingdom Builder designed by Donald X. Vaccarino, builds on this already exciting world of skill acquisition and land dominance.

There are 24 location tiles with 8 brand new abilities and 12 summary cards for the edges of the board. There are 4 new board quadrants that contain the Marshes land type on them. Castles have been replaced with Forts for a different scoring possibility. To go along with this new land type, 5 Marsh terrain cards have also been added to the terrain deck.

What makes the Marshes expansion special are the bonus abilities. For the included new abilities, a bonus ability is unlocked if you are able to collect that ability twice. For example, if you have collected the Rider ability, you can move one of your pieces into an adjacent land hex. If you collect a second Rider, then in addition to getting to move twice via your Riders, you may also jump one piece in a straight line to the first empty land hex.