This is a map of the coast of England near Ipswich, showing the location of Sealand. The boundaries of the territorial water of the United Kingdom are also drawn, both the 3 nautical mile limit (5.556km) before 1987 and the 12nm limit (22.22km) after 1987. The same radii are also given around Sealand.
<a href="//commons.wikimedia.org/wiki/User:IM3847" title="User:IM3847">IM3847</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>