Last updated July 2026
The New River Estuary lies adjacent to Invercargill in Southland, New Zealand. This large tidal lagoon estuary covers approximately 4,100 hectares and forms where the Oreti and Waihopai Rivers meet the sea. It supports extensive mudflats, seagrass meadows and saltmarshes that sustain rich biodiversity, including more than 80 bird species. Visitors enjoy scenic trails for walking, running and cycling, plus swimming opportunities at nearby Ōmāui beach. The estuary also faces ongoing environmental pressures from nutrient runoff and sedimentation that Environment Southland monitors closely.
Practical Information
| Location | Adjacent to Invercargill, Southland |
| Area | Approximately 4,100 ha |
| Mean depth | About 2 m |
| Key habitats | Mudflats, seagrass meadows, saltmarshes |
| Bird species | More than 80 recorded |
| Access | Multiple entry points with parking near Invercargill; trails suitable for walking and cycling |
| Swimming | Ōmāui beach offers family swimming and picnicking |
| Management | Environment Southland monitors water quality and sedimentation |
About New River Estuary
The New River Estuary is a shallow tidal lagoon estuary situated next to Invercargill. It receives freshwater inflows from the Oreti and Waihopai Rivers and discharges into the sea. The estuary blends urban edges, grazed pastures and bushland margins with extensive intertidal zones that provide important feeding and breeding grounds for fish, shellfish and birds.
Over the past 150 years, land reclamation for urban and agricultural development has altered the estuary’s tidal flows and reduced some natural habitats. Despite these changes, the area remains a regionally significant wetland that supports migratory waders and other wildlife. Environment Southland conducts regular monitoring of water quality, macroalgae and sedimentation to track ecological health.
The estuary holds cultural importance for Māori, with evidence of settlement and resource use in the Murihiku region dating back centuries. Ngāi Tahu have longstanding connections to the area through food gathering and trade. European settlement from the mid-19th century brought further landscape modifications through reclamation and farming.
Cycling Tracks
The Invercargill Estuary Walkway provides a popular loop trail suitable for cycling. The track adjoins the Waihopai River walkway and cycleway, allowing riders to extend journeys along the estuary edge. A 4.7 km Pleasure Bay lagoon loop offers an easy Grade 2 option with scenic views and interpretation panels.
Cyclists can also connect to the Invercargill to Bluff Trail, an off-road route that passes through estuary landscapes. Mountain biking is permitted on sections of the Estuary Walkway. Parking is available at several access points, including near Stead Street Wharf and the Roger Sutton Boardwalk.
Swimming
Ōmāui beach, located on the New River Estuary, provides a family-friendly swimming spot with plenty of space for picnicking. The beach features good water access and is backed by walking tracks that offer estuary views. Visitors should check current water quality information from Environment Southland before swimming, as conditions can vary with tides and runoff.
Swimming is best enjoyed during calmer conditions at Ōmāui. The area also supports other low-impact activities such as beachcombing and short walks along the adjacent reserves.
Walking Trails and Birdwatching
Scenic walking trails follow the estuary edge and include boardwalk sections that provide elevated views over the lagoon. The main Invercargill Estuary Walkway forms a loop of approximately 5 km and features information points highlighting ecology and history. Trails are generally flat and accessible, with rest areas and parking nearby.
Birdwatching is a highlight, with peak activity during high or receding tides when waders feed on the mudflats. Species commonly observed include oystercatchers, gulls, terns and shags. The estuary supports Southland’s highest numbers of migratory waders among local sites.
What Visitors Often Say
Visitors appreciate the easy, flat trails that suit walking, running and cycling while offering peaceful estuary views and good birdwatching opportunities close to the city.
Many enjoy the family-friendly beach at Ōmāui for swimming and picnics, noting the combination of coastal access and nearby walking tracks as a convenient day out.
Where to Learn More
Environment Southland: Official information on estuary monitoring, water quality and management.
LAWA: Current and historical water quality data for New River Estuary.
Department of Conservation: Overview of Southland wetlands and birdlife at the estuary.
Frequently Asked Questions
What activities are available at New River Estuary?
Walking, running, cycling and birdwatching are popular on the estuary trails. Swimming is available at Ōmāui beach, and the area supports photography and picnicking.
Is the estuary suitable for cycling?
Yes, the Invercargill Estuary Walkway and adjoining Waihopai cycleway provide flat, scenic routes suitable for cycling, with connections to longer trails toward Bluff.
Where can I swim near the estuary?
Ōmāui beach on the New River Estuary offers family swimming and picnicking space. Check current water quality updates from Environment Southland before entering the water.
When is the best time for birdwatching?
High or receding tides bring the most feeding activity for waders. Spring and autumn migrations also increase species diversity.
Are dogs allowed on the trails?
Dog access follows Invercargill City Council rules; check signage at trailheads for current restrictions.
Is fishing permitted?
Recreational fishing is allowed subject to regional regulations. Contact Environment Southland or Fish & Game for current rules and bag limits.
Are the trails wheelchair accessible?
Sections of the boardwalk and main paths are relatively flat, but visitors should confirm current conditions with Invercargill City Council for specific accessibility needs.
Who manages the estuary?
Environment Southland leads monitoring and management, working with Invercargill City Council and community groups on water quality and habitat protection.
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