Rhode Island has a coastline of 384 miles (618 km). However, this figure is a bit tricky because it includes the coastline of all the islands within the state.

Here's a breakdown:

* Mainland coastline: Around 100 miles (161 km)

* Island coastline: Around 284 miles (457 km)

The island coastline is significantly longer because it includes all the inlets, bays, and coves that are part of the state's many islands, including:

* Block Island

* Conanicut Island (Jamestown)

* Aquidneck Island (Newport, Middletown, Portsmouth)

* Prudence Island

* Hope Island

* Patience Island

* Dutch Island

So, depending on what you're looking for, the coastline of Rhode Island can be considered either 384 miles (618 km) or around 100 miles (161 km).