The group's driver was injured and released shortly after the abduction, which took place near the village of Kibati, just north of Goma, on the morning of Friday May, 11.
"She was one of the Park's 26 female rangers and was highly committed, showing true bravery in her work", said Park Director Emmanuel de Merode.
The two Brits were abducted along with their driver at the Virunga wildlife sanctuary on Friday.
Ms Davies and Mr Jesty said in a statement released by the Foreign Office: "We are very relieved that there has been a positive outcome to the kidnapping and are very grateful for the excellent support we have received".
A park ranger, Rachel Makissa Baraka, was killed during the kidnapping while trying to stop the kidnappers from grabbing the tourists.
UK Foreign Office said on Sunday that the two British tourists being held hostage in the Democratic Republic of Congo (DRC) had been released.
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Boris Johnson did not supply any additional particulars within the assertion launched Sunday, however paid tribute to the authorities from the African nation and the Congolese Institute for Nature Conservation "for his or her tireless assist throughout this frightful case".
Until Friday's incident, no significant attack had been launched on tourists in the park for almost 20 years, despite scores of attacks on rangers and Congolese nationals living in or driving through the park, which hugs the Rwandan and Ugandan borders.
A park ranger who tried to protect them was shot dead by the attackers.
The national park, which runs along the border with Uganda and Rwanda, covers 3,000 sq miles (7,800 sq km).
Established in 1925, Virunga is home to about a quarter of the world's population of critically endangered mountain gorillas, as well as to eastern lowland gorillas, chimpanzees, okapis, lions, elephants and hippos.
The Foreign Office now - and before the kidnapping - advises against travelling to the area.