Gresik Regency is a regency within East Java Province of Indonesia. As well as a large part of the northern and western suburbs of the city of Surabaya, it includes the offshore Bawean Island, some 125 km to the north of Java and Madura. Almost a third of the Gresik Regency's area is the coastal area; the Districts in this zone are Kebomas District, Gresik District, Manyar District, Bungah District, and Ujungpangkah District.

East Java is a province of Indonesia located in the easternmost third of Java island. It has a land border only with the province of Central Java to the west; the Java Sea and the Indian Ocean border its northern and southern coasts, respectively, while the narrow Bali Strait to the east separates Java from Bali by around 2.29 kilometres (1.42 mi). Located in eastern Java, the province also includes the island of Madura, as well as the Kangean islands and other smaller island groups located further east and Masalembu archipelagos in the north. Its capital is Surabaya, the second largest city in Indonesia, a major industrial center and also a major business center. Banyuwangi is the largest regency in East Java and the largest on the island of Java.