What geographic region did Bismarck believe were "not worth the bones of a single Pomeranian grenadier"?

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Bismarck famously declared that the Balkans were "not worth the bones of a single Pomeranian grenadier" during the Congress of Berlin in 1878. He believed that the region would not bring any significant benefits to Germany and that involvement in the Balkan conflicts would only create unnecessary tension with other European powers.

What Geographic Region Did Bismarck Believe Were "Not Worth the Bones