Here are some more specific places:

* Along the edges of continents: This is where the majority of coasts are located. Think of the coasts of North America, South America, Africa, Europe, Asia, and Australia.

* Around islands: Islands are surrounded by coasts, both big and small.

* At the mouths of rivers: Where rivers flow into the sea, you often find a coastline.

* On the edges of lakes and seas: While technically not "ocean coasts", these areas still exhibit many coastal features.

Essentially, any place where the land transitions to water is considered a coast.