Gulf of Finland
... that the entire 30,000 km2 (12,000 sq mi) area of the Gulf of Finland may freeze in winter?
... that the entire <span about="#mwt88" data-mw='{"parts":[{"template":{"target":{"wt":"convert","href":"./Template:Convert"},"params":{"1":{"wt":"30000"},"2":{"wt":"km2"},"3":{"wt":"sqmi"},"abbr":{"wt":"on"}},"i":0}}]}' id="mwHNE" typeof="mw:Transclusion">30,000</span><span about="#mwt88" typeof="mw:Entity"> </span><span about="#mwt88">km</span><sup about="#mwt88">2</sup><span about="#mwt88"> (12,000</span><span about="#mwt88" typeof="mw:Entity"> </span><span about="#mwt88">sq</span><span about="#mwt88" typeof="mw:Entity"> </span><span about="#mwt88">mi)</span> area of the <b id="mwHNI"><a href="./Gulf_of_Finland" id="mwHNM" rel="mw:WikiLink" title="Gulf of Finland">Gulf of Finland</a></b> may freeze <i id="mwHNQ">(pictured)</i> in winter?