Which Hawaiian island is the only one with a navigable river?

Kauai is the only Hawaiian island with a navigable river, which makes it unique among the islands. The most notable river is the Wailua River, renowned for its scenic beauty and accessibility. The Wailua River is approximately 20 miles long and allows for boat tours, which provide visitors with a unique way to experience the lush tropical surroundings and cultural landmarks along its banks, such as waterfalls and ancient temples.

This navigable river serves as a reminder of Kauai's diverse geography, which includes not just beautiful beaches but also inland waterways, making it a popular destination for outdoor activities like kayaking and hiking. Other islands, like Maui, Molokai, and Oahu, while beautiful in their own right, do not have rivers that are considered navigable in the same way.