Coastlines are mathematically fractal objects; therefore a coastal city ideally has special properties. This paper analyzes the proper connections that encourage urban life in a coastal city. Longitudinal flows along the coast should be moved inland, where they cannot damage transverse flows towards and away from the coast. Those transverse flows should be emphasized by the infrastructure. Furthermore, the speed and intensity of flows have to be made to slow down as one approaches the coast, so as to encourage urban exchanges. Finally, network analysis suggests that a bridge connecting facing coastal cities will more likely serve major urban centers elsewhere, at the expense of the local cities hosting the bridge.