29 July 2016 Last updated at 08:38 BST
It's now reached the Pacific Ocean and video filmed from a helicopter shows the hot liquid rock from the Kilauea volcano falling off the cliffs.
Officials there say that the lava isn't putting any towns in danger but have warned tourists to keep their distance.

The 22-year-old midfielder returns to his native Denmark, having been unable to establish himself as a first-team regular since his arrival from FC Midtjylland in January 2012.
He made his Fulham debut in 2014 and played a total of 68 games for the club, scoring seven goals.
Christensen ended last season on loan at Burton Albion, along with Fulham forward Cauley Woodrow.
He featured for Denmark in this summer's European Under-21 Championship.
Find all the latest football transfers on our dedicated page.
Lava from a volcano in Hawaii that has been erupting for two months, has been moving towards the coast.
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Lasse Vigen Christensen has left Fulham to join Brondby for an undisclosed fee.