The Srisailam devasthanam describes the Mallikarjuna kshetra as a sacred area with four main entrances and four sub gateways, one on each side, following the Skanda Purana and the Srisaila Khandam. This guide lists them in the order the devasthanam gives: the four main gates first, then the sub gates it describes.
The four main gates
The devasthanam calls Tripuranthakam the prime one of the four gateways. Shiva is worshipped on the hill as Tripurantakeshwara, in an east-facing temple with gopurams on four sides, and the goddess at the foot of the hill as Balatripurasundari Devi. Next to the hill temple is the way to Srisailam, and the devasthanam mentions a cave near the temple that is believed to hold a secret path there.
On the bank of the Penna in Siddhavatam mandal of YSR Kadapa district, reached by the road that crosses Badvel. The name comes from the banyan trees around it, held to be visited by Siddhas. The deity is Sri Siddhavateshwara, and the devasthanam notes that pilgrims to Srisailam once came here first.
The seat of Jogulamba, one of the 18 Shakti Peethas, and of the nine Brahma temples that give the place its other name, Brahmapuri. The devasthanam calls it a southern Kashi, with the main temple between the Vedavati and Nadavati rivers. There are two temple complexes: the Brahmeshwara temple with Balabrahmeshwara as the main deity, and Papanashanam about 1 km away with 62 temples.
On a Nallamalla hill near Achampet. On the Srisailam to Hyderabad road, get down at Munnanooru or Rangapuram and walk about 3 km. There are upper and lower temples, joined by a road and steps. The devasthanam notes there is no bus to it, so come by a private vehicle or on foot.
The sub gates
In Valluru mandal of YSR Kadapa district, where the devasthanam says five rivers meet. Pushpagiri has two main shrines, Vaidyanatha (Shiva) and Chennakeshava (Vishnu), so it draws devotees of both. The Brahmotsavam for both deities runs each year in the Chaitra to Vaishakha window. The devasthanam says an auto from Kadapa is the way there.
Called Someshwaram by locals and Skandasomeshwaram in the Srisaila Khandam, on the right bank of the Penna (Pinakini). The devasthanam counts it as old as the other gateways.
A Shiva temple at a meeting of seven rivers in Kurnool district, which the devasthanam lists with the sub gateways. It stays under the Srisailam reservoir for about eight months of the year and comes out when the water drops, so devotees visit in March, April, May and June. The devasthanam suggests staying in Kurnool for the visit, and gives bus routes through Nandikotkur and Machhumarri, or through Atmakur and Kapileshwaram, and, for travellers from Telangana, a bus from Mahabubnagar to Somashila and a boat from there.
Planning around Srisailam
The gates are spread across three districts, and the devasthanam gives their distances from Kadapa, Nellore and Kurnool, not from Srisailam. Plan each one as its own trip, and use the how to reach Mallikarjuna page for the main temple and the nearby page for what is closer to the temple.