Which Russian gulf is the largest gulf of the Sea of Japan?

The Russian gulf that is the largest gulf of the Sea of Japan is Peter the Great Gulf.

It occupies the southern coast of Primorsky Krai, stretching about 185 kilometres from the Russian–North Korean border near the Tumen River to Cape Povorotny. Its deeply indented shoreline includes the major bays of Amur Bay and Ussuri Bay, as well as the important port city of Vladivostok.

The gulf’s coastline is roughly 1,500 kilometres long, and its waters contain numerous islands and smaller bays. The Muravyov-Amursky Peninsula and the Eugénie Archipelago help divide its inner waters. Nakhodka Bay is notable because it is generally the only Russian Pacific location in the region whose ocean waters do not freeze during the winter.

The names in the wrong-answer list are all real nearby features, which makes this question tricky. Amur Bay and Ussuri Bay are major bays within Peter the Great Gulf, while Aniva Bay lies much farther north around Sakhalin Island. The gulf was renamed in 1859 in honour of Tsar Peter the Great.