1) Beijing, China
2) Jakarta, Indonesia
3) Dhaka, Bangladesh
4) Yokohama, Japan
Explanation:
The International Association of Athletics Federations (IAAF) World Relays 2019 was held in Yokohama, Japan from May 11 to 12, 2019. Total 43 nations participated in the two day event. The event was organised by International Association of Athletics Federation (IAAF). The top 10 finishers in the IAAF World Relays 2019 in men’s and women’s 4×400 m relays event and top 12 finishers in mixed 4×400 m relays event have qualified for the IAAF World Athletics Championship which will going to held in Doha, Qatar from September 28 to October 6, 2019.