Ensenada (entsənädə) [key], city (1990 pop. 259,979), Baja California state, NW Mexico. Developed in the 19th cent., Ensenada is the oldest deep-sea port in Baja California and is one of the most important ports in Mexico. It is a primary processing and shipping point for the region's agricultural produce, which includes grains, cotton, and fish. Ensenada also possesses a broad-based manufacturing industry created largely through foreign investment (see maquiladoras). The city is also a popular tourist attraction.