Arafura by-election: What voters in the NT seat need to know ahead of polling day on March 18

Voters across a large swathe of the Top End, including the Tiwi Islands and Kakadu National Park, have been heading to the polls.  (ABC News: Hamish Harty)

Voters in the remote Top End electorate of Arafura are to heading to the polls in a by-election race contested by two local leaders.

The seat takes in much of west Arnhem Land, including the world heritage listed Kakadu National Park, as well as all of the Tiwi Islands to the north of the territory's capital of Darwin.