Question: the 15th Asian Games were held in a city located on which gulf ?

Context paragraphs:
2006 Asian Games opening ceremony: The 2006 Asian Games Opening Ceremony was held in Doha, Qatar on 1 December 2006 to mark the start of the 15th Asian Games.  The ceremony took place in the multi-purpose Khalifa International Stadium, which was specifically renovated for the Asian Games.  The ceremony was attended by over 50,000 spectators, as well as approximately 20,000 athletes and performers.  Several Asian heads-of-state and the President of the International Olympic Committee Jacques Rogge were in attendance.  The officials and organizers of the ceremony promised it to be the most spectacular opening ceremony in recent years.  The Opening Ceremony was described by the media to be one of the most breath-taking and technologically spectacular multi-sports event ceremony, and the most expensive multi-sports event ceremony (including both Opening and Closing ceremonies) in the history of Asian Games.

Kazakhstan at the 2006 Asian Games: Kazakhstan competed in the 15th Asian Games, officially known as the XV Asiad held in Doha, Qatar, from December 1 to 15, 2006.  Kazakhstan ranked 4th with 23 gold medals in this edition of the Asiad.

Doha: Doha (Arabic: الدوحة‎ ‎ , "ad-Dawḥa " or "ad-Dōḥa", ] , literally in MSA: "the big tree", locally: "rounded bays") is the capital city and most populous city of the State of Qatar.  Doha has a population of 1,351,000 in a city proper with the population close to 1.5 million.  The city is located on the coast of the Persian Gulf in the east of the country.  It is Qatar's fastest growing city, with over 50% of the nation's population living in Doha or its surrounding suburbs, and it is also the economic centre of the country.

2013 Asian Indoor and Martial Arts Games: The 4th Asian Indoor and Martial Arts Games, which is also counted as the 4th Asian Indoor Games and designated as AIGs 4, was held in Incheon, South Korea, from 29 June to 6 July 2013, despite the ongoing 2013 Korean crisis.  It was initially slated for Doha, Qatar, after the country cancelled the last edition of Asian Indoor Games in 2011.  However, Incheon was chosen as a replacement instead by the OCA.  This event also acted as a test event and a prelude to the 2014 Asian Games.

K. J. Kapil Dev: K. J. Kapil Dev is an Indian volleyball player from Kerala.  He represented India in many international competitions.  Kapil also led the Indian National Volleyball Team on a number of occasions, including the "Rashid Memorial International Volleyball Tournament" held at Dubai in July 2006 and 15th Asian Games at Doha.  He was also a member of Indian team that won the title in South Asian Games at Dhaka in 2010.  At the national level championships, Kapil represents Indian Railways.

1974 Asian Games medal table: The 1974 Asian Games (officially known as the Seventh Asian Games) was a multi-sport event held in Tehran, Iran from September 1, 1974, to September 16, 1974.  This was the first time that Asian Games were celebrated in any Middle East country.  A total of 3,010 athletes selected from 25 Asian National Olympic Committees participated in 16 sports divided into 202 events.  The number of participating countries was the greatest in Asian Games history, eighteen nations competed in Bangkok, host of the 1970 Asian Games.  Fencing, gymnastics (artistic) and women's basketball were included for the first time; while sailing—which made its debut in the previous Asian Games—was not included, however since 1978, sailing is a part of the Asian Games sports.

Asian Para Games: The Asian Para Games is a multi-sport event held every four years after every Asian Games for athletes with physical disabilities.  The first Games was held in 2010 in Guangzhou, China after the 16th Asian Games.  The 2nd Asian Para Games was held in 2014 Incheon, South Korea.

2002 Asian Games medal table: The 2002 Asian Games (officially known as the 14th Asian Games) was a multi-sport event held in Busan, South Korea from September 29 to October 14, 2002.  Busan was the second South Korean city to host the Games, after Seoul in 1986.  A total of 6,572 athletes—4,605 men and 1,967 women—from 44 Asian National Olympic Committees (NOCs) participated in 38 sports divided into 419 events.  The number of competing athletes was higher than the 1998 Asian Games, in which 6,544 athletes from 41 NOCs participated.  It was the first time in the history of the Asian Games that all 44 member nations of the Olympic Council of Asia (OCA) participated in the Games.  Afghanistan returned after the fall of the Taliban government in the midst of ongoing war; East Timor, newest member of the OCA made its debut; and North Korea competed for the first time in an international sporting event hosted by South Korea.  Both nations marched together at the opening ceremony with a Korean Unification Flag depicting the Korean Peninsula as United Korea.

Zhang Guozheng: Zhang Guozheng (; born September 14, 1974 in Shunchang, Nanping, Fujian) is a Chinese weightlifter.  Zhang is a World champion, Olympic champion and World Record holder.  In January, 1999, Zhang Guozheng was named a member of the National Men's weightlifting team.  He ranked fourth at the Sydney Olympic Games in 2000 in the 69 kg class.  On October 3, 2002, at the Busan Asian Games, Zhang Guozheng took gold in the 69 kg class with a total score of 345 kilograms.  In 2004, Zhang Guozeng won the Athens Olympic Games in the 69 kg class champion.  On December 3, 2006, at the 15th Asian Games, Zhang Guozheng totaled 336 kg for a gold medal with a 152 kg snatch and a 184 kg clean and jerk.  Zhang retired after 2008 and now serves as the deputy head coach for the men's weightlifting team.

2010 Asian Para Games medal table: The 2010 Asian Para Games (officially known as the Guangzhou 2010 Asian Para Games) was a multi-sport event held in Guangzhou, China from December 12–19, 2010, in which athletes with physical disabilities competed against one another.  The Games replaced the FESPIC Games (Far East and South Pacific Games for the Disabled), and were held two weeks after the conclusion of the 16th Asian Games.  A total of 2,512 athletes from 41 Asian National Paralympic Committees participated in the Games, competing in 19 sports.  In the Games, 17 world and 82 Asian records were broken, compared with 3 world and 103 Asian records in the 2010 Asian Games.

Supporting paragraphs: Kazakhstan at the 2006 Asian Games Doha
Answer: the Persian Gulf