The Ruamahanga River is located in the Wairarapa region of New Zealand's North Island. It flows approximately 140 kilometers, starting from the eastern slopes of the Tararua Range and emptying into the Palliser Bay. The river is known for its scenic beauty and is an important waterway for the local ecosystem. The river supports various recreational activities, including fishing, kayaking, and hiking along its banks. It is also significant for the local Māori communities, who have historical and cultural ties to the river. The Ruamahanga River plays a vital role in the region's agriculture and water management.