There are three ports in Tonga: Nuku’alofa, Neiafu and Paangai in terms of merchant marine.  

The Port of Nuku'alofa is the Kingdom of Tonga's leading port, on the main island of Tongatapu, serving the country’s vital international trades through a broad range of cargo handling and logistics services. 

The Ports Authority manages and maintains the operations and assets of the ports, encouraging the development of commercially viable and efficient ports in Tonga. (Source: https://www.portsauthoritytonga.com/about-port-authority )     

The existing ports have sufficient capacity for foreseeable needs, and whilst the port system meets these basic needs for coverage, capacity, and compliance; the standard of infrastructure has suffered from a lack of investment in core infrastructure and facilities; and insufficient emphasis on maintenance of outer-island ports and channels.  

However, these issues are being addressed as part of the Government of Tonga’s National Infrastructure and Investment Plan (NIIP).