Leon knew the location of the Emerald Corridor only through the map.
Northeast of Watchtower Port, adjacent to a vast forest of the Talia Alliance, spanning perhaps hundreds of thousands of square kilometers—an area as large as half a province on Earth.
With such an expanse, even if Leon flew thousands or tens of thousands of meters into the sky to survey the land, unless Slankus noticed him and actively came up to the sky, finding the nest wouldn't be an easy task—especially if the nest was concealed with care. Even if it were a grand palace conspicuously erected in the open, locating it would still pose challenges.
But now, with Hinton as his guide—since the Green Dragon's territory bordered the Emerald Corridor and Slankus undoubtedly knew the area well—Leon quickly found Slankus's lair.