What is the top division of the Japan professional football league called

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1Japan Football League

The Japan Football League, (Japanese: 日本フットボールリーグ, Hepburn: Nihon Futtobōru Rīgu) also known as simply the JFL is the 4th tier of the Japanese association football league system, positioned beneath the three divisions of the J.League, and the top tier of amateur football in the country.
https://en.wikipedia.org/wiki/Japan_Football_League

2English football league system

The English football league system, also known as the football pyramid, is a series of interconnected leagues for men’s association football clubs in England, with five teams from Wales, one from Guernsey, one from Jersey and one from the Isle of Man also competing. The system has a hierarchical format with promotion and relegation between leagues at different levels, allowing even the …
https://en.wikipedia.org/wiki/English_football_league_system

3J1 League

J1 League. 2019; J2 League; J3 League; Japan Football League; Regional Leagues; Emperor Cup; J-League Cup; Super Cup; Play-offs 1/2; Play-offs 2/3; J Youth Cup; Nadeshiko League 1; Nadeshiko League 2; Empress’s Cup; Nadeshiko League Cup; Nadeshiko League Cup 2; Women’s Play-offs 1/2; New Year Cup
https://us.soccerway.com/national/japan/j1-league/2019/regular-season/r51011/

4What is the top division of the Japan professional football league called
The Premier league contains a single division and is comprised of 20 clubs. This league is also called as the top flight. The league is officially called as the Barclays Premier League, as it is being sponsored by the Barclays bank. The premier league is the most watched football league in the world.
https://www.hierarchystructure.com/english-football-league-hierarchy/

5What is the top division of the Japan professional football league called
The English Football League pyramid is one, if not the most watched sport across the globe.. The series of interconnected leagues is run in a hierarchical system with promotion and relegation in place across every division and It is that promotion/relegation aspect which provides most of the entertainment.
https://blog.grosvenorcasinos.com/english-football-league-pyramid-guide/

6J1 League

J1 League. 2020; J2 League; J3 League; Japan Football League; Regional Leagues; Emperor Cup; J-League Cup; Super Cup; Play-offs 1/2; Play-offs 2/3; J Youth Cup; Nadeshiko League 1; Nadeshiko League 2; Empress’s Cup; Nadeshiko League Cup; Nadeshiko League Cup 2; Women’s Play-offs 1/2; New Year Cup
https://us.soccerway.com/national/japan/j1-league/2020/regular-season/r56737/

7What is the top division of the Japan professional football league called
The FA Women’s Super League was restructured and re-branded ahead of the 2018-19 season. Now fully professional, it is a 12-team competition for the top teams in the country. The season has moved to a more traditional football calendar with matches taking place from September.
http://www.thefa.com/womens-girls-football/leagues-and-competitions/introduction-to-womens-leagues-and-competitions

8What is the top division of the Japan professional football league called
At the top of the hierarchy is the professional level called the J.League. Next is the semi-professional level called the Japan Football League, followed by regional and then by prefectural leagues. The J.League was started in 1993 and it is currently comprised of three divisions – J. League Division 1 (J1), J. League Division 2 (J2) and J. League Division 3 (J3).
https://www.japan-guide.com/e/e2083.html

9American football

The National Football League (NFL) isn’t the only professional American football league. Diehard American football fans can watch games in the summer months, football’s traditional offseason, and watch games in countries other than the United States. Here’s a rundown of the NFL’s sister leagues: Arena Football: Arena football is a fast-paced, offense-oriented, indoor sport played […]
https://www.dummies.com/sports/football/professional-american-football-leagues-besides-the-nfl/

10What is the top division of the Japan professional football league called
Not just between the top and bottom clubs, but between the top clubs and everyone else. What has also changed is the increasingly hand-to-mouth existence of the less well-off. Until the end of 1992 — the year the Premier League was formed — English football had recorded ten instances of a club entering administration.
https://jacobinmag.com/2020/08/english-football-capitalism-manchester-premier-league-fc/

News results

1Football: J-League cancels match, Nagoya players positive for COVID-19
TOKYO: Japan’s top-flight football league called off a match Sunday (Jul 26 … the past few weeks under strict infection-prevention protocols. Eight other first-division games on Sunday were expected to go ahead as scheduled. The J-League returned …
https://www.channelnewsasia.com/news/sport/covid-19-j-league-cancels-match-nagoya-players-test-positive-12964092
Published Date: 2020-07-26T06:17:00.0000000Z

BING based on video search results

1  J-League Kawasaki Frontale Fans singing songs and bouncing around
A prime example of why we think the J-League is the best football league on planet earth for colour and theatre © AMA SPORTS PHOTO AGENCY more images available from www.amasportsphotoagency.com (available to professional picture buyers only)
Watch Video: https://www.youtube.com/watch?v=VmMR7nsDAC8

Wikipedia based search results

1Premier League
The Premier League, often referred to as the English Premier League or the EPL outside England, is the top level of the English football league system…
https://en.wikipedia.org/wiki/Premier League

2Playoffs
2013 to form the Scottish Professional Football League (SPFL), reuniting the top four divisions of Scotland since the breakaway of the SPL in 1998–99…
https://en.wikipedia.org/wiki/Playoffs

3A-League
The A-League is the highest-level professional men’s soccer league in Australia. At the top of the Australian league system, it is the country’s primary…
https://en.wikipedia.org/wiki/A-League