Southern District Police have concerns for the wellbeing of a woman who they say was last seen leaving Riverton Holiday Park on foot at around noon on Friday (June 21).

Police posted on their Facebook account that Mariana Teuila Isara has been reported missing after she failed to board a bus from Invercargill to Christchurch on Friday.

"We believe Mariana is intending to walk part of the Te Araroa Trail – From Round Hill (Colac Bay) over the Longwood Range to Merivale Road near Tuatapere," the post says.

"If you have any information concerning Mariana’s whereabouts please contact Constable Daryl Williams of Riverton Police on 03 2347074."