Poison River

The  is a moat in the Clan Fort introduced in the 13.0.0 update.

Appearance
It appears to be lime colored water.

Use
It replaces the default Simple Sea with this sea.

Theme
Poison themed.

Trivia

 * Despite having "river" in its name, the events of Siege could take place on a land near a sea, judging from the name of the other moat, such as the Simple Sea and the Frozen Sea.