The fourth annual Vineyard Triathlon begins at 8 a.m. on Saturday, Sept. 7 at Waban Park in Oak Bluffs. The course includes a 1.2-mile swim, a 56-mile bike, and a 13.1-mile run.

There is also a sprint option with a .33-mile swim, 13-mile bike 13, and 3.2 mile run.

Visit vineyardtriathlon.com .