Reference

The 4 × 100 metres relay is a track and field event in which teams of four runners each complete a 100-metre leg in a race against other teams. Here are some of the countries that participate in this event:

1. Canada: Known for their strong performances in recent years.
2. United States: A traditional powerhouse in this event, especially strong in both men's and women's relays.
3. Jamaica: Another dominant force, especially noted for their performances in the early 2010s with figures like Usain Bolt.
4. Great Britain: Often competitive with multiple appearances in finals and podium finishes.
5. People's Republic of China: Increasingly competitive in the sprint relays.
6. Germany: Regularly participates and fields strong teams.
7. Japan: Known for their efficient baton exchanges and consistent performances.

For detailed information about the relays and performance specifics, you can refer to the Wikipedia page on the 4 × 100 metres relay at the Olympics and other resources like World Athletics.

Here are some images related to the 4 × 100 metres relay: