The scale of China's land reclamation in the South China Sea is leading to "serious questions" on its intentions, a top US official says.
China is building artificial land by pumping sand on to live coral reefs - some of them submerged - and paving over them with concrete. China has now created over 4sq/km (1.5 sq miles) of artificial landmass. China is creating a great wall of sand with dredges and bulldozers over the course of months.
Tags: borders, political, conflict, water, China, East Asia.
Via Seth Dixon