The Sundarbans has been declared a UNESCO World Heritage Site. The part of the forest within Indian territory is called Sundarbans National Park. The previous text is in English. Here is a translation to Chinese (Simplified):
孙德尔本斯 (Sundarbans) 已经被联合国教科文组织宣布为世界遗产。印度境内的这部分森林被称为孙德尔本斯国家公园。