Vyadhapura was a city located along the Mekong River, likely in what is now known as Cambodia in the province of Prey Veng. It was capital of the Kingdom of Funan early in its history. Chinese reports indicated that it was about 120 miles from the sea.
The modern name in Khmer is Banteay Prey Nokor.
References
Vyadhapura Wikipedia(Text) CC BY-SA