Square kilometre

In each case, the grid lines enclose one square kilometre.

The area enclosed by the walls of many European medieval cities were about one square kilometre.

Examples include: Parks come in all sizes; a few are almost exactly one square kilometre in area.

Here are some examples: Using the figures published by golf course architects Crafter and Mogford, a course should have a fairway width of 120 metres and 40 metres clear beyond the hole.

[17][Note 1] Examples of golf courses that are about one square kilometre include:

Part of an Ordnance Survey map, published 1952. The grid lines are at one-kilometre intervals, giving each square an area of one square kilometre. The map shows that the area of the island is about two square kilometres.
Map of Delft , Netherlands, dated 1659. The walls enclosed an area of about 1 square kilometre.