The Boston Rowing Marathon is an annual head of the river race run over a 31 mile course on the River Witham between Lincoln and Boston (UK).

The course was first rowed in 1946 (see newspaper story) as a private challenge for a coxed four from Boston Rowing Club.
Presently the race attracts in excess of 200 entries, covering the complete spectrum of the rowing community from the highly competitive to the more recreational crews, with many hoping to break a course record, raising money for their local charity, or just even to say they've done it!
 

The race is organized by Boston Rowing Club and is run in accordance with the Amateur Rowing Associations Rule of Racing and Water Safety Code.