The Annah Rias Hotspring has been around for 250 years, hidden away near the vicinity of Annah Rais longhouse settlers, and now the hotspring is open for public.
The Annah Rais Hot Spring is a natural phenomenon due to the presence of underground water heated by geothermal conditions and then shoots above the ground. It later flows its hot water into Sungai Semadang or better known as Sungai Sarawak Kiri.
There are bamboo groves on both side of the river banks, giving the place a scenic view.
You can also see small fishes swimming in its water, as well as seeing small bubbles produce from the gas present in the hot spring.