Each morning, four children stand barefoot in a line and proudly sing the national anthem as the Thai flag is raised outside their school, perched on a finger of land surrounded by the sea.
They are the last pupils left at the school in Ban Khun Samut Chin, a coastal village in Phra Samut Chedi district of Samut Prakan, less than 10 kilometres from the edge of Bangkok that is slowly being devoured by the waves.
