Masterton is a large town in the Greater Wellington Region of New Zealand that operates as the seat of the Masterton District. It is the largest town in the Wairarapa, a region separated from Wellington by the Remutaka ranges. It stands on the Waipoua stream between the Ruamāhunga and Waingawa Rivers – 100 kilometres north-east of Wellington and 40 kilometres south of Eketāhuna.