Prime Minister Manmohan Singh, who left Monday morning on a two-day visit to Nay Pyi Taw, the capital of Myanmar, to take part in the third summit of the BIMSTEC, said peace, stability and development of countries of this sub-regional grouping, with over 20 percent of the world's population and over $2.5 trillion worth of GDP, was indispensable for the march of Asia.