A bushwalker discovered human remains off a trail south of Adelaide, sparking a major police investigation.

A member of the public made the discovery five metres down a ravine off a trail in the Spring Mount Conservation Park at about 5.30pm yesterday.

South Australia Police detective inspector Andrew Macrae said initial investigations suggest the body could have been in the same Inman Valley location for several years.

The body was found in Spring Mount Conservation Park at about 5.30pm yesterday.The body was found in Spring Mount Conservation Park at about 5.30pm yesterday. (9News)

“The remains are very decomposed,” Macrae said.

“I’m very confident that this person was murdered.”

The body will undergo forensic testing and examination.

South Australia Police detective inspector Andrew Macrae.South Australia Police detective inspector Andrew Macrae. (9News)

“It is a bush track they were walking along and it was actually some local wildlife they were looking at off to the side of the track which alerted them to look in that direction,” Macrae said.

“Then they saw something which caught their eye and they investigated and that’s when they found the remains.”

State Emergency Service volunteers and South Australia Police combed through the rugged terrain last night and today.

An Anzac Day march at Goolwa had to be called off due to the large number of police officers required for the investigation.

A bushwalker has discovered human remains off a trail south of Adelaide, sparking a major police investigation. A member of the public made the discovery five metres down a ravine off a trail in the Spring Mount Conservation Park at about 5.30pm yesterday. State Emergency Service volunteers and South Australia Police combed through the rugged terrain last night and today.State Emergency Service volunteers and South Australia Police combed through the rugged terrain today. (9News)

“The circumstances in which we found it makes us very confident that the person was unfortunately murdered,” Macrae said.

“The identity of the person is not yet known and will have to be formally conducted in the coming days.

“I’m confident that won’t take too long.”

Police will investigate any connection to Taskforce Southern.

Inman Valley on the Fleurieu Peninsula of South AustraliaBody found in dense bushland could have been there for years, police say (9News)

The taskforce looked into the alleged southern suburbs drug-related murders of Trevor King, Robert Atkins and Jeff Mundy.

Large scale searches for Mundy have previously been conducted nearby at Myponga reservoir in 2023.

Mundy was last seen in 2020 and is the only one yet to be found.