Ther race will start and finish in the Tokyo Olympic stadium. The first 5k is downhill and then it's flat until the last 5km is uphill. It looks like it goes up about 100 feet on the hill between roughly 37 and 41k. There are a lot of turns.
“The winner here will also be able to tackle Paris,” Senior JAAF Director Toshinari Takaoka (2:06:16 in 2002) said during a news conference. “A tough course has been set with the aim of sending strong runners to the Paris Olympics.”
Here is a video:
Here is an article from the Japan Times:
And Brett Larner has translated an article from Hochi.News

