Hogland, or Gogland to the Russians who now own it, is a lump of granite in the middle of the Gulf of Finland, a long boat ride from the Finnish coast near Kotka. There is no road to ride to it, so on a motorcycle route this point is a marker for the Gulf of Finland and the island itself rather than somewhere you will actually park.
The island rises to a rocky ridge, the highest ground in the gulf, with pine on the slopes and a few small villages. Its fame comes from 1788, when a Russian fleet met a Swedish one in the Battle of Hogland, a bloody and inconclusive day that nonetheless wrecked Gustav III's plan to threaten St Petersburg by sea. The island belonged to Finland between the wars, with fishermen, a lighthouse and a Finnish-speaking population; in 1940, after the Winter War, it went to the Soviet Union and the Finns left. It is now a restricted border zone, so landing there is not a matter of simply turning up with a ferry ticket.
The gulf around it is shallow, cold and often foggy, and in winter it freezes, which the old pilots used as a road of its own. Seals and sea eagles use the skerries, and passing birds funnel along the coast in spring and autumn.
If you are riding the Finnish or Russian shore near here, fuel and food are in the towns on the coast; the nearest listed settlements are far enough away that the practical answer is to fill up in Kotka or Hamina on the Finnish side, or in the Leningrad region's coastal towns on the Russian side. Weather decides everything on this water, and the summer light lasts so long that you will find yourself looking at a white-grey horizon at eleven at night.