Prakasam district is one of the twelve districts in the coastal Andhra region of the Indian state of Andhra Pradesh. It was formed in 1970 and reorganised on 4 April 2022. The headquarters of the district is Ongole. It is located on the western shore of Bay of Bengal and is bounded by Bapatla district and Palnadu districts in the north, Nandyal district in the west, Kadapa and Nellore districts in the south. A part of north west region also borders with Nagarkurnool district of Telangana. It is the largest district in the state with an area of 14,322 km2 (5,530 sq mi) and had a population of 22,88,026 as per 2011 Census of India.

Coastal Andhra or Kosta Andhra is a geographic region in the States and union territories of India of Andhra Pradesh. Vijayawada is the largest city in this region. Region share borders with Uttarandhra, Rayalaseema and Telangana. It was part of Madras State before 1953 and Andhra State from 1953 to 1956. According to the 2011 census, it has an area of 91,915 square kilometres (35,489 sq mi) which is 57.99% of the total state area and a population of 34,193,868 which is 69.20% of Andhra Pradesh state population. This area includes the coastal districts of Andhra Pradesh on the Circar Coast between the Eastern Ghats and the Bay of Bengal, from the northern border with Odisha to Rayalaseema in the south.