The mother of a young Australian woman who died in a crash in Namibia says her family was proud her daughter had "lived [life] to the full, and in a way that gave back to society".
Jarrah Young, 27, of Queensland, and Sarah Penberthy, 22, a Brisbane nurse originally from Inverell in NSW, died after their tour group's truck veered off a road and overturned in Namibia near the town of Usakos on Wednesday.
Ms Young's brother was also on the truck when it crashed. He was thrown 35 metres and had bad cuts to his leg and feet, ABC reported.
He is expected to arrive back in Australia today.
Three other Australians were treated and discharged from hospital, a Department of Foreign Affairs (DFAT) spokeswoman said.
Ms Young's mother, Andrea Harris, told the ABC she wanted her daughter - a Gold Coast veterinarian - to be remembered as a "sunny, focused and driven girl".
"She was very content with herself, very ethical.
"We're oscillating between being very numb and emotional at the moment. We're all very, very sad," Ms Harris said.
She described her son as having the "worst job anyone could have".
"I'm very much looking to seeing him," she said.
Ms Harris said her daughter had been working in Kenya for the past year.
The family had met Ms Young and toured East Africa for six weeks last year.
"She organised a beautiful trip for us. It was so nice we had that time together.
"Life is short, and it's there to be lived. I'm so pleased Jarrah lived it to the full, and in a way that gave back to society, not in a frivolous way."
'I miss you so much'
Ms Penberthy was on a four-month African holiday after graduating from the Queensland University of Technology.
Her friends and relatives posted condolences and memories on her Facebook page.
"So Sad. You took life with 2 hands and gave it hell. RIP Sarie," wrote her cousin, Christine Roberts.
A friend wrote: "You were the perfect partner in crime and a fantastic friend. The memories I have are the kind that last a lifetime."
Others added: "Your kickarse attitude toward life and open heart will always be how I remember you. R.I.P Sarah" and "I miss you so much, the world is worse off for not having you in it!!"
Truck's wheel broke off: police
The women were travelling south to the city of Swakopmund with a group of 11 tourists on an overland truck run by the African Trails travel company, The Namibian newspaper reported.
African Trails describes itself as an overland tour operator based in the United Kingdom that specialises in African safaris.
Police told the newspaper that one of the truck's wheels broke off and was found some distance from the site of the crash.
The ABC reported that the truck was driven by an Australian.
It was also carrying tourists from Britain, the Philippines, the Netherlands and Germany, The Namibian said.
The DFAT spokeswoman said an Australian consular official had travelled to Namibia to help the injured Australians and the families of the deceased.
- with James Robertson