Mojokerto is a city in East Java Province of Indonesia. It is located 40 km southwest of Surabaya, the provincial capital, and constitutes one of the component units of the Surabaya metropolitan area which comprises Gresik Regency, Bangkalan Regency, Mojokerto Regency, Mojokerto City, Surabaya City, Sidoarjo Regency, and Lamongan Regency. The city covers an area of 20.21 km2, and had a population of 120,196 at the 2010 census and 132,434 at the 2020 Census; the official estimate as of mid-2023 was 141,785.

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.