Vung Boi - De Gi, an unspoiled destination in Phu Cat District around 40 km from Quy Nhon Town, has become the center of attention after some of the giant creatures were spotted off the beach earlier this month.
The beach is famous for its clear, blue waters.
Lensman Nguyen Phan Dung Nhan of Quy Nhon said he and his friends hired a boat to reach the area where the whales are.
Diving expert and local tour guide Tommy Toan said that he spotted the whales a month ago.
Initially he saw eight whales but now there are only two left, a male and a female.
Toan said he first encountered the whales on July 26 when he was taking tourists to Hon Trau Islet, about 8 kilometers from the shore.
He described the whales as "blue whales" but experts from Vietnam Institute of Oceanography said careful observation is needed to accurately determine the species.
Vo Van Quang from the institute said recent photos suggested there were whales from two species in De Gi.
According to folklore, whales are auspicious creatures because fishermen have a good harvest when they appear.
Nhan said his group gathered in Quy Nhon on Wednesday afternoon and traveled to De Gi fishing port and hired the boat for the 20-minute trip, and shot the whales for 90 minutes.
Whales feed on small fish, small plankton and krill which drift with the nutrient rich waters where they live.
Nhan hoped local authorities would keep the beach pristine and clean so that whales and other marine mammals return here to feed again in future.
Whales near Vung Boi-De Gi beach.