Tokyo
From Memory Alpha, the free Star Trek reference
Tokyo was the capital city in Japan on Earth.
When the Whale Probe was trying to contact the humpback whales in the oceans, the city became completely covered with clouds. (Star Trek IV: The Voyage Home)
Kyle Riker, during his career as a civilian adviser, was once stationed near Tokyo where he was posted at Tokyo Base, where he worked out the Fuurinkazan battle strategies. (TNG: "The Icarus Factor")
