The races are due to take place at Odaiba Marine Park, a small island in Tokyo Bay, where an Olympic rings monument was installed today in preparation for the Games. 

The Olympic competition consists of a 1.5 kilometres swim, a 40km cycle ride and a 10km run for both men and women, with 55 athletes scheduled to take part in each event. 

Two changes have been made to the Olympic course, with the bike section, comprising eight laps of 5km, moved from the west promenade to the side of Divercity Tokyo Plaza and the Statue of Gundam.

The lane of the Daiba crossing has also been altered. 

Up first is due to be the men's competition on July 27, followed by the women's contest the following day. 

Last month, the time of the races was moved to 6.30am, an hour earlier than initially planned, due to growing concerns over the Tokyo summer heat. 

For the triathlon in the Paralympics, the run has changed from three laps of 1.66km to four laps of 1.25km.

Athletes will also contest a 750 metres swim and 20km cycle. 

A total of four male and four female events are scheduled, with 80 participants in total.

Competition is scheduled for August 29 and 30. 

The Paralympic test event in August was mired in controversy after the swimming section was cancelled because of high levels of E.coli bacteria found in the water.

Tokyo 2020 have since announced plans for further water screening efforts to ensure athlete safety during the Games.