The largest camel race involved 1,108 participants and was achieved by The Administrative Office of the Governor of Umnogovi aimag (Mongolia), in Dalanzadgad city, Umnogovi aimag, Mongolia, on 7 March 2016.
The race was just over 15 km long with the fastest finishing in 35 min 12 sec and the whole race completed in 1 hr 8 min. The race was organized with the purpose of increasing the population/use of domestic Bactrian camels in Mongolia.
http://www.guinnessworldrecords.com/world-records/largest-camel-race