It is a cognate of the Scandinavian languages' words for skerry – Icelandic, Faroese: sker, Danish: skær, Swedish: skär, Norwegian: skjær / skjer, found also in German: Schäre, Finnish: kari, Estonian: skäär, Latvian: šēra, Lithuanian: šcheras and Russian: шхеры (shkhery).
The island fringe of Norway is such a group of glacially formed skerries, called a skjærgård (sometimes translated into English as archipelago, but specifically one near the coast of the mainland).
Many of the cross fjords are so arranged that they parallel the coast and provide a protected channel behind an almost unbroken succession of rocky islands and skerries.
Another such skerry-protected passage extends from the Straits of Magellan north for 800 km (500 mi) along the west coast of the South American continent.
This area is experiencing post-glacial rebound that connects the rising islands as they break sea level, revealing till deposits and eventually clay bottoms.