According to Wikipedia: The Blue Mountains are the longest mountain range in Jamaica. They include the island's highest point, Blue Mountain Peak, at 2256 m (7402 ft). The Blue Mountains rise to its elevations from the coastal plain in the space of about 16 kilometres (9.9 mi), thus producing one of the steepest general gradients in the world. This forms cooling relief from the sweltering heat of the city of Kingston. Their summits rise and fall for 24 miles and span 14 miles at their widest point. The temperature decreases from around 27°C (80°F) at sea level to 5°C (40°F) at the Blue Mountain Peak, just 16 km (9.9 mi) inland.