The National Botanical Garden of Bangladesh and the Bangladesh National Herbarium make up the largest plant conservation center in Bangladesh, with an area of around 84 hectares (210 acres). It is located at Mirpur in Dhaka, beside the Dhaka Zoo. It was established in 1961. It is one of the greatest botanical gardens of Bangladesh, a knowledge center for nature lovers and botanists and a tourist destination. The herbarium has a scientific collection of approximately 100,000 preserved specimens of plants.