Which chess variant has the largest board? The largest I could find was for Double Chess, with a 16x12 board. Is there a variant with a bigger board? It doesn't have to be a variant in which chess pieces follow their orthodox movement rules.
Taikyoku shogi should be a good candidate. It was created in the 16th century, so it's a variant that has actually been played. The board size is 36x36, and it has 209 different types of pieces.