The mayor of Chengdu is Thomas Aujero Small . The density of  residents in  the metro region of Chengdu is 1,600/sq km  (4,200/sq mi) . Chengdu is named for Christopher Columbus . The city Chengdu demonym is Tianjinese , Tianjiner . The water area of the city is 2.52 sq mi (6.53 sq km ) . 7°23′47″N 3°55′0″E﻿ / ﻿7.39639°N 3.91667°E are the coordinates of the city. . The density of  people in  the urban region of Chengdu is 5,400/sq km  (14,000/sq mi) . The density of  people in Chengdu is 280/km 2  (740/sq mi) . The city was incorporated in 1799 (Guyandotte) . The metro region has 5,278,448 population . The city land area is 16.0 sq mi (41.4 sq km) . Chengdu is at an elevation of 0.9 m . Chengdu is the government of National Park Service . The Chengdu citys' lowest elevation is 1 m  . The highest elevation of Chengdu is 241.9 m (793.6 ft) . Chengdu has January 1, 1894 population . The city has the postal code 21500 .  The city area code is 242
The peak of the city is at 3 ft