How large is the dom board for it to be seen by the entire realm like damn

The massive dom board sits on a lonely pillar of earth, worn ever-lethargically by the calm, far-out waters of the Sea of a Thousand Voices, where its workers may observe elemental turmoil just offcenter from the middle of the waters so the eyes of onlookers may peer far into each territory. It looms above: spindly, needle-like, and eerie, as the only landmass of its kind for many leagues, and tears a hole in the serene Sornieth skies with its abrupt form. On this isle, an ever-vigilant team of the largest, fastest, and most observant dragons tends to the intense tracking of elemental wars.