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Absolutely - The Shire is bounded on the west by downland, and in the south by marshes. We know them now as the South Downs and the Romney Marsh. Rómenna is a very ancient name, from the spirit language Quenya, referring to an old harbour.
On the east, The Shire is marked by the River Baranduin, its name meaning golden-brown. The hobbits knew it as the Brandywine. This was crossed by a bridge; in Dover to this day we have Bridge Street, crossing what we now call the Dour (after that well-known grumpy-guts Henry VIII, who is said to have first married Anne Boleyn in secret in Dover). Though they may no longer understand the significance of their actions, inhabitants of the town still pay homage to the ancient ways and lore by the imbibing of golden-brown liquids, leaving their shiny cylindrical tokens, the containers of this magical liquid, on the banks of the river to mark their passing.
As for the secret tunnels under the castle and elsewhere in Dover, who is to say that these are not ancient hobbit holes? Inhabitants could be there still, protected by an agreement, under the cntract of Elf and Safety, that certain of the tunnels will not be opened to the public in return for the big folk - us - having use of some. That the little folk are still around is proved by Kath's amazing photo; I'm not sure they are hobbits either, and the middle one has rather the look of a leprechaun about him. Whatever the case, I certainly wouldn't want to meet one of those Ents behind them on a dark night!