The Round Island Route (RIR) is a scenic and picturesque trail that encircles Singapore's main island, providing a unique way to explore the diverse landscapes and natural beauty of the city-state. The trail covers approximately 150 kilometers and allows hikers and cyclists to experience Singapore's green spaces, coastlines, nature reserves, and cultural landmarks.

The Round Island Route is part of the larger Singapore Park Connector Network (PCN), which is a system of interconnected walking and cycling paths that link various parks, neighborhoods, and recreational areas across the country. The RIR, in particular, offers an uninterrupted journey, taking adventurers through a variety of terrains, from urban landscapes to rural settings and coastal stretches.