A token cannot be placed on a Water space. If the player has a token adjacent to a Water space, the player can cross the waterway.
To cross the waterway, the player sacrifices one of their three tokens for that turn and then places a token either (see image below):
a) On a space that is adjacent to any Water space on that waterway
b) On a space adjacent to a temple that is adjacent to the waterway the player is crossing
The waterway consists of all Water spaces that touch horizontally or vertically, even if the Water space is on a different map tile. The player cannot place a token on a mountain, temple, or water space this way. Note that if the player places a token on a forest this way, that player does not have to sacrifice an additional token.
If the player has a token adjacent to a temple that is adjacent to a Water space, the player can cross that waterway as if they were adjacent to the Water.