Spreading over 10,000 square kilometers, the Sundarbans is the largest mangrove forest in the world. 6000 square kilometers fall in Bangladesh while 4000 square kilometers fall in West Bengal of India. In 1997, the Sundarbans was declared as a World Heritage site by UNESCO. The forest is home to the famous Royal Bengal Tiger, the national animal of Bangladesh. According to 2011 tiger census, there are 180 tigers. The forest derived its name from Heritiera littoralis locally known as “Sundari Tree.” There are other animals like crocodiles, snake, king cobras, lizards etc. There are various trees such Goran, Genwa, Dhundal, Garjan, Kankra, Sundari etc.