Estádio Municipal José Batista Pereira Fernandes, known as Distrital do Inamar or Arena Inamar, is a football stadium in Diadema, São Paulo, Brazil.

It has a maximum capacity of 10,000 people, and hosts the home matches of Água Santa.

Inaugurated on 22 May 2009 to attend amateur matches of the region, the stadium only held a professional match on 27 April 2013, when Clube Atlético Diadema beat Mauaense by 5–1 in a Campeonato Paulista Segunda Divisão match.

[1] It was named after José Batista Pereira Fernandes, a community leader in the local nearby neighbourhoods who devoted his life to the well-being of the people.

[2] The stadium saw Água Santa's meteoric rise through the tiers of the Campeonato Paulista, but never had any night matches due to the lighting structure.