Bengali or Bangla (বাংলা) is spoken in India (mostly West Bengal) and Bangladesh.
The first Asian to receive the Nobel Prize for Literature (1913), Rabindranath Tagore has composed the National Anthem for both India and Bangladesh.
International Mother Language Day has been observed every year since February 2000 to promote linguistic and cultural diversity and multilingualism. The date represents the day in 1952 when students demonstrating for recognition of their language, Bangla, as one of the two national languages of the then Pakistan, were shot and killed by police in Dhaka, the capital of what is now Bangladesh.
Here are the flags of India and Bangladesh: