Officials from Bhutan, India, Indonesia, Malaysia and Nepal held a two-day meeting this week on Indonesia's western Sumatra island to discuss the plight of the animals.
Two out of three Asian rhino species -- the Sumatran and Javan rhinos -- are critically endangered, and the third, the greater one-horned rhino, is classified as vulnerable.
The populations have dwindled rapidly as poachers hunt the animal for its horn which is highly valued for use in traditional Chinese medicine, and the WWF says only around 3,500 rhinos remain in the wild in Asia.
The agreement set out steps to increase the populations, such as improving biological monitoring and management and carrying out tough anti-poaching operations.
Protection group the International Union for Conservation of Nature hailed the agreement as a "major step towards Asian rhino recovery".
"The number of surviving Asian rhinos, especially of Javan and Sumatran rhinos, is currently so low that maintaining their populations is not enough to secure their survival," said Simon Stuart, chair of the IUCN's species survival commission.
The WWF hailed the agreement made at the conference, which concluded yesterday, but urged governments to follow through with concrete action.
"Now is the time for action, to implement these methods where they are needed most," said Dr. Christy Williams, from the WWF's Asian rhino and elephant programme.
The IUCN said there could be fewer than 100 Sumatran rhinos, and there were only an estimated 50 Javan rhinos, remaining in the wild.
There are around 3,300 greater one-horned rhinos mainly in India and Nepal, the IUCN said.
