The Belt and Road Initiative (BRI) put forward by China in 2013 includes the land-based ‘Silk Road Economic Belt’ and the ocean-based ‘21st-Century Maritime Silk Road’ (MSR) which focuses on the promotion of cooperation between States along the Belt and the Road. As the UN Convention on the Law of the Sea (LOSC) has established the global maritime order, all ocean-related activities generating from the BRI projects along the MSR are in principle subject to the LOSC governance. The Belt and Road Initiative and the Law of the Sea discusses the use of oceans in the context of BRI covering navigational safety, marine energy and sea ports, maritime law enforcement and access of landlocked states to the sea. It also examines the BRI challenges and difficulties in the maritime domain.