waiariki - hot spring
Waiariki, n. Hot spring. Ko te wahi i u ai ia he waiariki; ko Waikimihia te ingoa (T. 132).
Williams Dictionary
I te noho kau ia i (roto i) te waiariki.He was sitting naked in the hot-spring.
He aha koe e noho nei i roto i te waiariki?Why are you sitting in the hot pool?