The same considerations about barriers and detours that apply to long-distance land-bird migration apply to water birds, but in reverse: a large area of land without bodies of water that offer feeding sites may also be a barrier to a bird that feeds in coastal waters. Detours avoiding such barriers are observed: for example, brent geese Branta bernicla migrating from the Taymyr Peninsula to the Wadden Sea travel <answer>via the White Sea coast and the Baltic Sea</answer> rather than directly across the Arctic Ocean and northern Scandinavia.
How do brent geese migrate?
via the White Sea coast and the Baltic Sea