El Salvador plans to build the world's first "Bitcoin City," funded initially by Bitcoin-backed bonds, President Nayib Bukele said on Saturday, doubling down on his bet to harness the cryptocurrency to fuel investment in the Central American country.

Speaking at an event closing a weeklong promotion of Bitcoin in El Salvador, Bukele said the city planned in the eastern region of La Union would get geothermal power from a volcano and not levy any taxes except for value added tax (VAT).

"Invest here and make all the money you want," Bukele said in English, dressed all in white and wearing a reversed baseball cap, in the beach resort of Mizata. "This is a fully ecological city that works and is energized by a volcano."