One Piece

Reverse Mountain is a colossal and imposing peak where the four Blues converge, serving as one of the two known entrances to the Grand Line. At its base lies the Twin Cape, where rivers from the Blues defy gravity, ascending the mountain before flowing into the Grand Line. The mountain's unique climate, colder than its surrounding waters, serves as a treacherous barrier for many would-be pirates who often perish against its rocky cliffs amid tumultuous storms.

Aerial view of a towering, jagged mountain surrounded by turbulent seas, with five rivers flowing upward from each side, adorned with ten square arcs marked by intricate tribal patterns and sea creature carvings, beneath a stormy sky.