The Karuvatta boat race or the Brothers Trophy Boat Race is held every year during the Onam season at the Karuvatta village in Alappuzha district. A variety of spectacular cultural activities are organised during the race. The snake boat race is currently part of Kerala Tourism's Champions Boat League (CBL).
The event was founded by the Karuvatta Brothers Arts & Sports Club in 1966. The race is held on the Karuvatta leading water channel and it was initially known as the Karuvatta Leading Channel Boat Race. The bunds on either side of the channel are used as galleries during the event.
The race track is 1200 metres long and it stretches from Thaivypinkadavu to St. Joseph's Church. There is a permanent pavilion at the church premises. The Brothers Trophy Boat Race was initially conducted for smaller snake boats like Churulan, Odi and Veppu vallams. Nowadays, all major snake boats vie for this trophy. Vibrant festivities including a colourful procession are held during the event.