Lumajang Regency is a Regency (kabupaten) located in the East Java province of Indonesia. It covers an area of 1,790.90 sq. km, and had a population of 1,006,458 at the 2010 Census; the latest official estimate (as at 2014) is 1,034,730. It shares its borders with Jember Regency (to the east), Probolinggo Regency (to the north), and Malang Regency (to the west). It borders the Indian Ocean to the south.