跨海大桥为跨越海峡或连接岛屿的桥梁。桥梁随者长度的不同工法也有不同，越长的桥梁，工程技术越复杂，越需要配合良好管理技术营建管理GPS卫星空照图才能顺利进行。

A fixed link, fixed crossing, or bridge–tunnel is a persistent, unbroken road or rail connection across water that uses some combination of bridges, tunnels, and causeways and does not involve intermittent connections such as drawbridges or ferries.

The Confederation Bridge was commonly referred to as "The Fixed Link" by residents of New Brunswick and Prince Edward Island prior to its official naming.