Ernakulam district has an area of 895 sq. km, and an altitude of 300 m, and can be divided geographically into highland, midland, and coastal area. Ernakulam district is bordered by the Arabian Sea in the west, Thrissur District in the north, Idukki District in the east, and Alappuzha and Kottayam districts in the south. The Periyar River, which is Kerala's second longest, flows through all the taluks except Muvattupuzha. The Muvattupuzha River and a branch of Chalakkudy River also flow through the district. The district has an optimum climate, and mostly lies within the Malabar Coast moist forests ecoregion, while the highlands are part of the South Western Ghats moist deciduous forests ecoregion.
- Area: 2407 sq.km
- Population: 3,105,798 (in 2001)
- Language: Malayalam and English
- Religion: Hindu, Christian, Muslim, Jains, Sufi, Jews, Sikhs
- Average Rainfall(Annually): 3432 mm
- Temperature: 23-32 degree Celsius
- Sivarathri: It is celebrated at the Siva Temple of Aluva and attracts people from all across the country.
- Christian Pilgrim Center Festival: The famous Christian Pilgrim Center at Malayttoor is located in Ernakulam district, where the annual festival in April lasts for 10 days.
- St. George Church Festival: It is located in Kadamattam, and was founded by Mar Abo Metropolitan in 5th Century A.D. A cross was brought from Persia, which is still preserved in the church. The cross attracts numerous pilgrims every year to visit the place.
Ernakulam has a significant place among the districts of Kerala in the domain of literacy and educational standards. Ernakulam District is the first district throughout the country to have achieved 100 percent literacy by 1990.