The tendency of the dunes to drift off on the landward side is prevented by the planting of bent-grass (Arundo arenaria), whose long roots serve to bind the sand together.
The older city, including both the Zealand and Amager portions, was formerly surrounded by a complete line of ramparts and moats; but pleasant boulevards and gardens now occupy the westward or landward site of fortifications.
South-west from this point extends the line of gardens which occupy the site of former landward fortifications, pleasantly diversified by water and plantations, skirted on the inner side by three wide boulevards, Ostervold, Norrevold and Vestervold Gade, and containing noteworthy public buildings, mostly modern.
The landward defences of Copenhagen, it may be added, were left unprovided for after the Napoleonic wars until the patriotism of Danish women, who subscribed sufficient funds for the first fort, shamed parliament into granting the necessary money for others (1886-1895).
Though reckoned a part of the Prussian province of Hanover it is completely surrounded on the landward side by Oldenburg territory.