Meg Haugh (26), from Ballintemple in Cork, was part of a group engaged in adventure activities in Badian in southwestern Cebu when she felt unwell around 11am on Thursday.
Ms Haugh and a friend were part of a group taking part in canyoneering, where they travel through canyons, streams and waterfalls by jumping, sliding, swimming and abseiling.
The Sun Star newspaper in the Philippines reported that Ms Haugh was more than halfway through the three-hour adventure and had completed two of the three jumps when she became ill.
The newspaper reported that a number of attendees, including a doctor who was canyoneering with another group, attempted to provide medical assistance.
According to reports, those present initially had difficulty contacting emergency services as they could not get a communications signal where they were.
Mrs Haugh was later taken to Badian District Hospital where she was pronounced dead.
Mrs Haugh was traveling abroad but was due to return to Ireland when the tragic incident occurred.
Clydiejun Baratbate, an official from the Badian Municipal Disaster Risk Reduction Management Office (MDRRMO), said communication signals in the area posed a problem and as a result, authorities were not alerted until around noon.
“When we received the call, we immediately sent our ambulance,” Baratbate told the Sun Star.
He said the canyoneering site was about 12 km from the MDRRMO.
He said that because of poor communications signal in the area, officials had previously requested portable radios as a way to call first responders to tourist sites.
“The reception of the signal is not good here because you still have to go up a bit (to get a signal)… We also requested an antenna because we noticed that during canyoneering, especially level two, it is already very low, so we can't reach our repeater. So there must be a basic radio at the entrance.”
Mrs Haugh was from the Ballintemple area of Cork and the local Avondale United football club, with which her family were involved, canceled their home games this weekend out of respect.
“It is with heavy hearts that we learn of the untimely passing of young Meg Haugh, daughter of Richard Haugh,” the club announced in a statement on Friday.
“As a mark of respect for Richard, our friend, child safety officer and committee member, with a long service to the club. the club academies are canceled today Friday May 3 and our home games at the weekend are cancelled.
“Our thoughts are with Richard and family, including uncle John Haugh, an underage coach, extended family and friends.
“May Meg rest in peace.”