The Sunderbans is the largest single block of tidal halophytic mangrove forest in the world. The name Sundarban means "beautiful jungle" or "beautiful forest" and might have been derived from the Sundari trees that are found in this region in large numbers. Alternatively, it has been proposed that the name is a corruption of Samudraban or "Sea Forest" or Chandra-bandhe- a name of a primitive tribe. The forest lies at the feet of the Ganges and is spread across areas of Bangladesh and West Bengal, India, forming the seaward fringe of the delta. The seasonally-flooded Sunderbans freshwater swamp forests lie inland from the mangrove forests. The forest covers 10,000 square km of which about 6,000 km are in Bangladesh. It became inscribed as a UNESCO world heritage site in 1997. The Sunderbans is intersected by a complex network of tidal waterways, mudflats and small islands of salt-tolerant mangrove forests. The area is known for the Royal Bengal Tiger, as well as numerous fauna including species of birds, spotted deer, crocodiles and snakes. The fertile soils of the delta have been subject to intensive human use for centuries, and the ecoregion has been mostly converted to intensive agriculture, with few enclaves of forest remaining. The remaining forests, together with the Sunderbans mangroves, are important habitat for the endangered tiger. Additionally, the Sunderbans serves as a protective flood barrier for the millions of inhabitants in and around Kolkata against the result of cyclone activity.

The Darjeeling Himalayan Railway or the "Toy Train" is a 2 ft (610 mm) narrow-gauge railway from Siliguri to Darjeeling in West Bengal, run by the Indian Railways. It was built between 1879 and 1881 and is about 86 km long. The elevation level is from about 100 m at Siliguri to about 2,200 m at Darjeeling. It is powered by a steam engine. Since 1999 the train has been a World Heritage Site as listed by UNESCO. In 2005, UNESCO added the Nilgiri Mountain Railway as an extension to the original inscription. Gillanders Arbuthnot & Co. constructed the railway. Several engineering adjustments were made later in order to ease the gradient of the rails. Despite natural calamities such as an earthquake in 1897 and a major cyclone in 1899 the Toy Train continued to improve with new extension lines, and the passenger as well as goods carrying was increasing.