Köping (historically) was an important Viking Age port of what is today's Sweden, covering an area of approximately 25 hectars, almost 4 times larger than the similar site on the island of Björkö near Stockholm.
Björkö, Ekerö | Björkö |
In the late 19th century, Hjalmar Stolpe, an entomologist by education, arrived on Björkö to study fossilized insects found in amber on the island.
There are a number of places called Keskisaari around Finland, including Lappee (Lapvesi) and Koivisto (Björkö) in Carelia and Maaninka.