In the quiet cartography of shared waters, a name becomes a declaration. Following an executive order from President Trump, Apple Maps began displaying Lake Ontario as 'Lake America' for American users in September 2026 — a change mirroring Google's earlier compliance, and one that Canada, which holds majority surface rights to the lake, has firmly refused to recognize. The episode reveals how digital maps, once understood as neutral representations of the physical world, have become terrain where national authority and geopolitical ambition are quietly, persistently contested.