Whirlpool (Surf Mat)

A whirlpool of unknown cause endangering any ship that sails too close.  A small whirlpool covers about 1/4 of the mat width.  A large whirlpool is about 1/2 the width of the mat.  Combine with Reefs for extra peril.

Note: these are are add-ons built into your mat and require purchase of a mat.  They are NOT stand-alone terrain pieces.