They are also thought to be responsible for inventions such as qanats and underground drainage galleries that bring water from an aquifer on the piedmont to gardens or palm groves on the plains. These inventions were very important reasons behind the success of the empire. The Mykians of the other side of ancient Maka, the present day region of Balochistan and Sindh, are thought to have later become independent, as they are not mentioned in Arrian of Nicomedia's account of the campaigns of Alexander the Great; he mentions only the Omani side of Maka, which he calls "Maketa".