Athletics at the 1908 Summer Olympics – Men's marathon view of the final yards, the direction of running was changed to "right-hand inside" (i.e. clockwise). This meant the distance in the stadium was shortened to , and the total distance became officially "about 26 miles plus 385 yards on the track". A modified version of the Polytechnic Harriers' April 1908 map was issued in June 1908 incorporating the changed ending and omitting the "Long Walk" start used for the Trial Marathon. This was published in the newspapers and in the official programme for the games. This distance (ignoring the word "about" in the phrase "about 26 miles plus 385
Bangkok Marathon course passes many historical landmarks of cultural and ethnic importance. The marathon starts and finishes in front of The Royal Grand Palace at Sanam Chai Road. The race course is sanctioned by The Association of International Marathons and Distance Races (AIMS) and the Amateur Athletic Association of Thailand (IAAF Rules). In 2013, the course of the half marathon was changed at the last minute because of concurrent Bangkok street protests which reduced the distance of the half marathon from 21.1 km (13.1 miles) to 19.7 km (12.2 miles). In 2015, the half marathon was accidentally extended from 21.1 km (13.1