Explain India's maritime relationship with Indonesia and describe the Borobudur Stūpa.

India and Indonesia have a maritime relationship dating back over 2,000 years through early maritime trade between Indian kingdoms and Java and Sumatra. The ancient university of Nālandā collaborated with the Muara Jambi temple complex in Indonesia. Islam also travelled to Indonesia from the shores of India, and the Indonesian currency (rupiah) carries Garuḍa, the vehicle of Viṣhṇu. The Borobudur Stūpa, built in the 8th and 9th centuries CE, is the world's largest Buddhist monument with a unique pyramidal shape consisting of five enormous platforms. It has over 500 statues of Buddha and many smaller stūpas, and its geometric design replicates a mandala representing the cosmos. Today, both countries work closely in regional groups for peace, trade, and sustainable development.